125512031 has 4 divisors (see below), whose sum is σ = 125597592. Its totient is φ = 125426472.

The previous prime is 125512027. The next prime is 125512033. The reversal of 125512031 is 130215521.

It is a happy number.

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 125512031 - 2² = 125512027 is a prime.

It is a super-2 number, since 2×125512031² = 31506539851489922, 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 = 125511994 and 125512012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125512033) 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, 40541 + ... + 43526.

It is an arithmetic number, because the mean of its divisors is an integer number (31399398).

Almost surely, 2^125512031 is an apocalyptic number.

125512031 is a deficient number, since it is larger than the sum of its proper divisors (85561).

125512031 is an equidigital number, since it uses as much as digits as its factorization.

125512031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85560.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 125512031 is about 11203.2152081445. The cubic root of 125512031 is about 500.6817779352.

Adding to 125512031 its reverse (130215521), we get a palindrome (255727552).

The spelling of 125512031 in words is "one hundred twenty-five million, five hundred twelve thousand, thirty-one".