125520431 has 4 divisors (see below), whose sum is σ = 126363000. Its totient is φ = 124677864.

The previous prime is 125520427. The next prime is 125520433. The reversal of 125520431 is 134025521.

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

It is a cyclic number.

It is not a de Polignac number, because 125520431 - 2² = 125520427 is a prime.

It is a super-2 number, since 2×125520431² = 31510757196851522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125520397 and 125520406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125520433) 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, 421061 + ... + 421358.

It is an arithmetic number, because the mean of its divisors is an integer number (31590750).

Almost surely, 2^125520431 is an apocalyptic number.

125520431 is a deficient number, since it is larger than the sum of its proper divisors (842569).

125520431 is an equidigital number, since it uses as much as digits as its factorization.

125520431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842568.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 125520431 is about 11203.5900942510. The cubic root of 125520431 is about 500.6929472047.

Adding to 125520431 its reverse (134025521), we get a palindrome (259545952).

The spelling of 125520431 in words is "one hundred twenty-five million, five hundred twenty thousand, four hundred thirty-one".