31444431377 has 2 divisors, whose sum is σ = 31444431378. Its totient is φ = 31444431376.

The previous prime is 31444431329. The next prime is 31444431419. The reversal of 31444431377 is 77313444413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15831678976 + 15612752401 = 125824^2 + 124951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31444431377 is a prime.

It is a super-2 number, since 2×31444431377² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31444431307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15722215688 + 15722215689.

It is an arithmetic number, because the mean of its divisors is an integer number (15722215689).

Almost surely, 2^31444431377 is an apocalyptic number.

It is an amenable number.

31444431377 is a deficient number, since it is larger than the sum of its proper divisors (1).

31444431377 is an equidigital number, since it uses as much as digits as its factorization.

31444431377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 41.

The spelling of 31444431377 in words is "thirty-one billion, four hundred forty-four million, four hundred thirty-one thousand, three hundred seventy-seven".