31361124181 has 2 divisors, whose sum is σ = 31361124182. Its totient is φ = 31361124180.

The previous prime is 31361124163. The next prime is 31361124191. The reversal of 31361124181 is 18142116313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28886061681 + 2475062500 = 169959^2 + 49750^2 .

It is a cyclic number.

It is not a de Polignac number, because 31361124181 - 2³³ = 22771189589 is a prime.

It is a super-2 number, since 2×31361124181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31361124121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15680562090 + 15680562091.

It is an arithmetic number, because the mean of its divisors is an integer number (15680562091).

Almost surely, 2^31361124181 is an apocalyptic number.

It is an amenable number.

31361124181 is a deficient number, since it is larger than the sum of its proper divisors (1).

31361124181 is an equidigital number, since it uses as much as digits as its factorization.

31361124181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The spelling of 31361124181 in words is "thirty-one billion, three hundred sixty-one million, one hundred twenty-four thousand, one hundred eighty-one".