31157425613 has 4 divisors (see below), whose sum is σ = 31329566268. Its totient is φ = 30985284960.

The previous prime is 31157425561. The next prime is 31157425643. The reversal of 31157425613 is 31652475113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31652475113 = 7 ⋅4521782159.

It can be written as a sum of positive squares in 2 ways, for example, as 1069747849 + 30087677764 = 32707^2 + 173458^2 .

It is a cyclic number.

It is not a de Polignac number, because 31157425613 - 2⁶ = 31157425549 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 (31157425643) 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, 86070056 + ... + 86070417.

It is an arithmetic number, because the mean of its divisors is an integer number (7832391567).

Almost surely, 2^31157425613 is an apocalyptic number.

It is an amenable number.

31157425613 is a deficient number, since it is larger than the sum of its proper divisors (172140655).

31157425613 is a wasteful number, since it uses less digits than its factorization.

31157425613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172140654.

The product of its digits is 75600, while the sum is 38.

The spelling of 31157425613 in words is "thirty-one billion, one hundred fifty-seven million, four hundred twenty-five thousand, six hundred thirteen".