31401431421377 has 2 divisors, whose sum is σ = 31401431421378. Its totient is φ = 31401431421376.

The previous prime is 31401431421343. The next prime is 31401431421407. The reversal of 31401431421377 is 77312413410413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23136013420081 + 8265418001296 = 4809991^2 + 2874964^2 .

It is a cyclic number.

It is not a de Polignac number, because 31401431421377 - 2⁶ = 31401431421313 is a prime.

It is a super-2 number, since 2×31401431421377² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31401431481377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15700715710688 + 15700715710689.

It is an arithmetic number, because the mean of its divisors is an integer number (15700715710689).

Almost surely, 2^{31401431421377} is an apocalyptic number.

It is an amenable number.

31401431421377 is a deficient number, since it is larger than the sum of its proper divisors (1).

31401431421377 is an equidigital number, since it uses as much as digits as its factorization.

31401431421377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 31401431421377 in words is "thirty-one trillion, four hundred one billion, four hundred thirty-one million, four hundred twenty-one thousand, three hundred seventy-seven".