31540042993 has 2 divisors, whose sum is σ = 31540042994. Its totient is φ = 31540042992.

The previous prime is 31540042987. The next prime is 31540043023. The reversal of 31540042993 is 39924004513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18642352369 + 12897690624 = 136537^2 + 113568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31540042993 is a prime.

It is not a weakly prime, because it can be changed into another prime (31540042913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770021496 + 15770021497.

It is an arithmetic number, because the mean of its divisors is an integer number (15770021497).

Almost surely, 2^31540042993 is an apocalyptic number.

It is an amenable number.

31540042993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540042993 is an equidigital number, since it uses as much as digits as its factorization.

31540042993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 31540042993 in words is "thirty-one billion, five hundred forty million, forty-two thousand, nine hundred ninety-three".