31349007783517 has 2 divisors, whose sum is σ = 31349007783518. Its totient is φ = 31349007783516.

The previous prime is 31349007783503. The next prime is 31349007783547. The reversal of 31349007783517 is 71538770094313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15948673229241 + 15400334554276 = 3993579^2 + 3924326^2 .

It is an emirp because it is prime and its reverse (71538770094313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31349007783517 - 2⁷ = 31349007783389 is a prime.

It is a super-2 number, since 2×31349007783517² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31349007783547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15674503891758 + 15674503891759.

It is an arithmetic number, because the mean of its divisors is an integer number (15674503891759).

Almost surely, 2^{31349007783517} is an apocalyptic number.

It is an amenable number.

31349007783517 is a deficient number, since it is larger than the sum of its proper divisors (1).

31349007783517 is an equidigital number, since it uses as much as digits as its factorization.

31349007783517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13335840, while the sum is 58.

The spelling of 31349007783517 in words is "thirty-one trillion, three hundred forty-nine billion, seven million, seven hundred eighty-three thousand, five hundred seventeen".