990717717097 has 2 divisors, whose sum is σ = 990717717098. Its totient is φ = 990717717096.

The previous prime is 990717717089. The next prime is 990717717113. The reversal of 990717717097 is 790717717099.

It is a happy number.

990717717097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 971833185856 + 18884531241 = 985816^2 + 137421^2 .

It is a cyclic number.

It is not a de Polignac number, because 990717717097 - 2³ = 990717717089 is a prime.

It is a super-2 number, since 2×990717717097² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990717717047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495358858548 + 495358858549.

It is an arithmetic number, because the mean of its divisors is an integer number (495358858549).

Almost surely, 2^990717717097 is an apocalyptic number.

It is an amenable number.

990717717097 is a deficient number, since it is larger than the sum of its proper divisors (1).

990717717097 is an equidigital number, since it uses as much as digits as its factorization.

990717717097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12252303, while the sum is 64.

The spelling of 990717717097 in words is "nine hundred ninety billion, seven hundred seventeen million, seven hundred seventeen thousand, ninety-seven".