31149619157 has 2 divisors, whose sum is σ = 31149619158. Its totient is φ = 31149619156.

The previous prime is 31149619153. The next prime is 31149619213. The reversal of 31149619157 is 75191694113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28371696721 + 2777922436 = 168439^2 + 52706^2 .

It is a cyclic number.

It is not a de Polignac number, because 31149619157 - 2² = 31149619153 is a prime.

It is a super-2 number, since 2×31149619157² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31149619153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15574809578 + 15574809579.

It is an arithmetic number, because the mean of its divisors is an integer number (15574809579).

Almost surely, 2^31149619157 is an apocalyptic number.

It is an amenable number.

31149619157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31149619157 is an equidigital number, since it uses as much as digits as its factorization.

31149619157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The spelling of 31149619157 in words is "thirty-one billion, one hundred forty-nine million, six hundred nineteen thousand, one hundred fifty-seven".