125523421 has 4 divisors (see below), whose sum is σ = 127581244. Its totient is φ = 123465600.

The previous prime is 125523403. The next prime is 125523439. The reversal of 125523421 is 124325521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124325521 = 953 ⋅130457.

It is an interprime number because it is at equal distance from previous prime (125523403) and next prime (125523439).

It can be written as a sum of positive squares in 2 ways, for example, as 65383396 + 60140025 = 8086^2 + 7755^2 .

It is a cyclic number.

It is not a de Polignac number, because 125523421 - 2⁵ = 125523389 is a prime.

It is a super-2 number, since 2×125523421² = 31512258439086482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125523491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028820 + ... + 1028941.

It is an arithmetic number, because the mean of its divisors is an integer number (31895311).

Almost surely, 2^125523421 is an apocalyptic number.

It is an amenable number.

125523421 is a deficient number, since it is larger than the sum of its proper divisors (2057823).

125523421 is an equidigital number, since it uses as much as digits as its factorization.

125523421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057822.

The product of its digits is 2400, while the sum is 25.

The square root of 125523421 is about 11203.7235328260. The cubic root of 125523421 is about 500.6969228125.

Adding to 125523421 its reverse (124325521), we get a palindrome (249848942).

The spelling of 125523421 in words is "one hundred twenty-five million, five hundred twenty-three thousand, four hundred twenty-one".