125131434157 has 4 divisors (see below), whose sum is σ = 125132609340. Its totient is φ = 125130258976.

The previous prime is 125131434139. The next prime is 125131434229. The reversal of 125131434157 is 751434131521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751434131521 = 10243 ⋅73360747.

It can be written as a sum of positive squares in 2 ways, for example, as 114610008681 + 10521425476 = 338541^2 + 102574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125131434157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125131432157) 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, 409978 + ... + 646795.

It is an arithmetic number, because the mean of its divisors is an integer number (31283152335).

Almost surely, 2^125131434157 is an apocalyptic number.

It is an amenable number.

125131434157 is a deficient number, since it is larger than the sum of its proper divisors (1175183).

125131434157 is a wasteful number, since it uses less digits than its factorization.

125131434157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175182.

The product of its digits is 50400, while the sum is 37.

Adding to 125131434157 its reverse (751434131521), we get a palindrome (876565565678).

The spelling of 125131434157 in words is "one hundred twenty-five billion, one hundred thirty-one million, four hundred thirty-four thousand, one hundred fifty-seven".