125137321 has 4 divisors (see below), whose sum is σ = 125934532. Its totient is φ = 124340112.

The previous prime is 125137277. The next prime is 125137339. The reversal of 125137321 is 123731521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123731521 = 53 ⋅2334557.

It can be written as a sum of positive squares in 2 ways, for example, as 15642025 + 109495296 = 3955^2 + 10464^2 .

It is a cyclic number.

It is not a de Polignac number, because 125137321 - 2⁷ = 125137193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125137351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398370 + ... + 398683.

It is an arithmetic number, because the mean of its divisors is an integer number (31483633).

Almost surely, 2^125137321 is an apocalyptic number.

It is an amenable number.

125137321 is a deficient number, since it is larger than the sum of its proper divisors (797211).

125137321 is an equidigital number, since it uses as much as digits as its factorization.

125137321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797210.

The product of its digits is 1260, while the sum is 25.

The square root of 125137321 is about 11186.4793836131. The cubic root of 125137321 is about 500.1830276602.

Adding to 125137321 its reverse (123731521), we get a palindrome (248868842).

The spelling of 125137321 in words is "one hundred twenty-five million, one hundred thirty-seven thousand, three hundred twenty-one".