125511431 has 4 divisors (see below), whose sum is σ = 125853792. Its totient is φ = 125169072.

The previous prime is 125511427. The next prime is 125511443. The reversal of 125511431 is 134115521.

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 125511431 - 2² = 125511427 is a prime.

It is a super-2 number, since 2×125511431² = 31506238623335522, 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 = 125511397 and 125511406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125511401) 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, 170630 + ... + 171363.

It is an arithmetic number, because the mean of its divisors is an integer number (31463448).

Almost surely, 2^125511431 is an apocalyptic number.

125511431 is a deficient number, since it is larger than the sum of its proper divisors (342361).

125511431 is an equidigital number, since it uses as much as digits as its factorization.

125511431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342360.

The product of its digits is 600, while the sum is 23.

The square root of 125511431 is about 11203.1884300854. The cubic root of 125511431 is about 500.6809801111.

Adding to 125511431 its reverse (134115521), we get a palindrome (259626952).

The spelling of 125511431 in words is "one hundred twenty-five million, five hundred eleven thousand, four hundred thirty-one".