125217431 has 4 divisors (see below), whose sum is σ = 125548200. Its totient is φ = 124886664.

The previous prime is 125217413. The next prime is 125217437. The reversal of 125217431 is 134712521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125217431 is a prime.

It is a super-2 number, since 2×125217431² = 31358810052479522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125217431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125217437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164816 + ... + 165573.

It is an arithmetic number, because the mean of its divisors is an integer number (31387050).

Almost surely, 2^125217431 is an apocalyptic number.

125217431 is a deficient number, since it is larger than the sum of its proper divisors (330769).

125217431 is an equidigital number, since it uses as much as digits as its factorization.

125217431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330768.

The product of its digits is 1680, while the sum is 26.

The square root of 125217431 is about 11190.0594725855. The cubic root of 125217431 is about 500.2897400690.

Adding to 125217431 its reverse (134712521), we get a palindrome (259929952).

The spelling of 125217431 in words is "one hundred twenty-five million, two hundred seventeen thousand, four hundred thirty-one".