690217911731 has 2 divisors, whose sum is σ = 690217911732. Its totient is φ = 690217911730.

The previous prime is 690217911697. The next prime is 690217911743. The reversal of 690217911731 is 137119712096.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690217911731 - 2¹⁴ = 690217895347 is a prime.

It is a super-2 number, since 2×690217911731² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (690217911791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345108955865 + 345108955866.

It is an arithmetic number, because the mean of its divisors is an integer number (345108955866).

Almost surely, 2^690217911731 is an apocalyptic number.

690217911731 is a deficient number, since it is larger than the sum of its proper divisors (1).

690217911731 is an equidigital number, since it uses as much as digits as its factorization.

690217911731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142884, while the sum is 47.

The spelling of 690217911731 in words is "six hundred ninety billion, two hundred seventeen million, nine hundred eleven thousand, seven hundred thirty-one".