125431421 has 4 divisors (see below), whose sum is σ = 125731200. Its totient is φ = 125131644.

The previous prime is 125431403. The next prime is 125431429. The reversal of 125431421 is 124134521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125431421 - 2⁶ = 125431357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125431429) 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, 149261 + ... + 150098.

It is an arithmetic number, because the mean of its divisors is an integer number (31432800).

Almost surely, 2^125431421 is an apocalyptic number.

It is an amenable number.

125431421 is a deficient number, since it is larger than the sum of its proper divisors (299779).

125431421 is an equidigital number, since it uses as much as digits as its factorization.

125431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299778.

The product of its digits is 960, while the sum is 23.

The square root of 125431421 is about 11199.6170023800. The cubic root of 125431421 is about 500.5745674915.

Adding to 125431421 its reverse (124134521), we get a palindrome (249565942).

The spelling of 125431421 in words is "one hundred twenty-five million, four hundred thirty-one thousand, four hundred twenty-one".