31541135557 has 2 divisors, whose sum is σ = 31541135558. Its totient is φ = 31541135556.

The previous prime is 31541135447. The next prime is 31541135581. The reversal of 31541135557 is 75553114513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26573564196 + 4967571361 = 163014^2 + 70481^2 .

It is a cyclic number.

It is not a de Polignac number, because 31541135557 - 2⁷ = 31541135429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31541135257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770567778 + 15770567779.

It is an arithmetic number, because the mean of its divisors is an integer number (15770567779).

Almost surely, 2^31541135557 is an apocalyptic number.

It is an amenable number.

31541135557 is a deficient number, since it is larger than the sum of its proper divisors (1).

31541135557 is an equidigital number, since it uses as much as digits as its factorization.

31541135557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157500, while the sum is 40.

The spelling of 31541135557 in words is "thirty-one billion, five hundred forty-one million, one hundred thirty-five thousand, five hundred fifty-seven".