125125125031 has 4 divisors (see below), whose sum is σ = 125125863912. Its totient is φ = 125124386152.

The previous prime is 125125125023. The next prime is 125125125053. The reversal of 125125125031 is 130521521521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 130521521521 = 7213 ⋅18095317.

It is a cyclic number.

It is not a de Polignac number, because 125125125031 - 2³ = 125125125023 is a prime.

It is a super-2 number, since 2×125125125031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125125125001) 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, 24840 + ... + 500866.

It is an arithmetic number, because the mean of its divisors is an integer number (31281465978).

Almost surely, 2^125125125031 is an apocalyptic number.

125125125031 is a deficient number, since it is larger than the sum of its proper divisors (738881).

125125125031 is an equidigital number, since it uses as much as digits as its factorization.

125125125031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738880.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 125125125031 its reverse (130521521521), we get a palindrome (255646646552).

The spelling of 125125125031 in words is "one hundred twenty-five billion, one hundred twenty-five million, one hundred twenty-five thousand, thirty-one".