31161940894093 has 2 divisors, whose sum is σ = 31161940894094. Its totient is φ = 31161940894092.

The previous prime is 31161940894069. The next prime is 31161940894103. The reversal of 31161940894093 is 39049804916113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30967421966244 + 194518927849 = 5564838^2 + 441043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31161940894093 is a prime.

It is a super-3 number, since 3×31161940894093³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31161940814093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15580970447046 + 15580970447047.

It is an arithmetic number, because the mean of its divisors is an integer number (15580970447047).

Almost surely, 2^{31161940894093} is an apocalyptic number.

It is an amenable number.

31161940894093 is a deficient number, since it is larger than the sum of its proper divisors (1).

31161940894093 is an equidigital number, since it uses as much as digits as its factorization.

31161940894093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The spelling of 31161940894093 in words is "thirty-one trillion, one hundred sixty-one billion, nine hundred forty million, eight hundred ninety-four thousand, ninety-three".