31277684717 has 2 divisors, whose sum is σ = 31277684718. Its totient is φ = 31277684716.

The previous prime is 31277684699. The next prime is 31277684723. The reversal of 31277684717 is 71748677213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30118214116 + 1159470601 = 173546^2 + 34051^2 .

It is a cyclic number.

It is not a de Polignac number, because 31277684717 - 2¹⁸ = 31277422573 is a prime.

It is a super-2 number, since 2×31277684717² (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 (31277680717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15638842358 + 15638842359.

It is an arithmetic number, because the mean of its divisors is an integer number (15638842359).

Almost surely, 2^31277684717 is an apocalyptic number.

It is an amenable number.

31277684717 is a deficient number, since it is larger than the sum of its proper divisors (1).

31277684717 is an equidigital number, since it uses as much as digits as its factorization.

31277684717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 53.

The spelling of 31277684717 in words is "thirty-one billion, two hundred seventy-seven million, six hundred eighty-four thousand, seven hundred seventeen".