31731603157 has 2 divisors, whose sum is σ = 31731603158. Its totient is φ = 31731603156.

The previous prime is 31731603149. The next prime is 31731603209. The reversal of 31731603157 is 75130613713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16732457316 + 14999145841 = 129354^2 + 122471^2 .

It is a cyclic number.

It is not a de Polignac number, because 31731603157 - 2³ = 31731603149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31731603457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15865801578 + 15865801579.

It is an arithmetic number, because the mean of its divisors is an integer number (15865801579).

Almost surely, 2^31731603157 is an apocalyptic number.

It is an amenable number.

31731603157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31731603157 is an equidigital number, since it uses as much as digits as its factorization.

31731603157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 37.

The spelling of 31731603157 in words is "thirty-one billion, seven hundred thirty-one million, six hundred three thousand, one hundred fifty-seven".