31550343157 has 2 divisors, whose sum is σ = 31550343158. Its totient is φ = 31550343156.

The previous prime is 31550343131. The next prime is 31550343169. The reversal of 31550343157 is 75134305513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31291487236 + 258855921 = 176894^2 + 16089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31550343157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31550343757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15775171578 + 15775171579.

It is an arithmetic number, because the mean of its divisors is an integer number (15775171579).

Almost surely, 2^31550343157 is an apocalyptic number.

It is an amenable number.

31550343157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31550343157 is an equidigital number, since it uses as much as digits as its factorization.

31550343157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94500, while the sum is 37.

The spelling of 31550343157 in words is "thirty-one billion, five hundred fifty million, three hundred forty-three thousand, one hundred fifty-seven".