31801953149 has 2 divisors, whose sum is σ = 31801953150. Its totient is φ = 31801953148.

The previous prime is 31801953137. The next prime is 31801953163. The reversal of 31801953149 is 94135910813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31797309124 + 4644025 = 178318^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 31801953149 - 2³² = 27506985853 is a prime.

It is a super-2 number, since 2×31801953149² (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 (31801956149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15900976574 + 15900976575.

It is an arithmetic number, because the mean of its divisors is an integer number (15900976575).

Almost surely, 2^31801953149 is an apocalyptic number.

It is an amenable number.

31801953149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31801953149 is an equidigital number, since it uses as much as digits as its factorization.

31801953149 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 44.

The spelling of 31801953149 in words is "thirty-one billion, eight hundred one million, nine hundred fifty-three thousand, one hundred forty-nine".