31423213557 has 24 divisors (see below), whose sum is σ = 45531397080. Its totient is φ = 20883202560.

The previous prime is 31423213537. The next prime is 31423213597. The reversal of 31423213557 is 75531232413.

31423213557 is a `hidden beast` number, since 31 + 42 + 32 + 1 + 3 + 557 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 22573860516 + 8849353041 = 150246^2 + 94071^2 .

It is not a de Polignac number, because 31423213557 - 2⁷ = 31423213429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423213537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9646273 + ... + 9649529.

It is an arithmetic number, because the mean of its divisors is an integer number (1897141545).

Almost surely, 2^31423213557 is an apocalyptic number.

It is an amenable number.

31423213557 is a deficient number, since it is larger than the sum of its proper divisors (14108183523).

31423213557 is a wasteful number, since it uses less digits than its factorization.

31423213557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293 (or 6290 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The spelling of 31423213557 in words is "thirty-one billion, four hundred twenty-three million, two hundred thirteen thousand, five hundred fifty-seven".