125431340131 has 4 divisors (see below), whose sum is σ = 125518507200. Its totient is φ = 125344173064.

The previous prime is 125431340113. The next prime is 125431340141. The reversal of 125431340131 is 131043134521.

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-125431340131 is a prime.

It is a super-2 number, since 2×125431340131² (a number of 23 digits) 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 125431340131.

It is not an unprimeable number, because it can be changed into a prime (125431340141) 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, 43581376 + ... + 43584253.

It is an arithmetic number, because the mean of its divisors is an integer number (31379626800).

Almost surely, 2^125431340131 is an apocalyptic number.

125431340131 is a deficient number, since it is larger than the sum of its proper divisors (87167069).

125431340131 is an equidigital number, since it uses as much as digits as its factorization.

125431340131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87167068.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 125431340131 its reverse (131043134521), we get a palindrome (256474474652).

The spelling of 125431340131 in words is "one hundred twenty-five billion, four hundred thirty-one million, three hundred forty thousand, one hundred thirty-one".