31223141557 has 2 divisors, whose sum is σ = 31223141558. Its totient is φ = 31223141556.

The previous prime is 31223141513. The next prime is 31223141603. The reversal of 31223141557 is 75514132213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28534304241 + 2688837316 = 168921^2 + 51854^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223141557 - 2⁷ = 31223141429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31223741557) 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 as a sum of consecutive naturals, namely, 15611570778 + 15611570779.

It is an arithmetic number, because the mean of its divisors is an integer number (15611570779).

Almost surely, 2^31223141557 is an apocalyptic number.

It is an amenable number.

31223141557 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223141557 is an equidigital number, since it uses as much as digits as its factorization.

31223141557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The spelling of 31223141557 in words is "thirty-one billion, two hundred twenty-three million, one hundred forty-one thousand, five hundred fifty-seven".