679090691 has 2 divisors, whose sum is σ = 679090692. Its totient is φ = 679090690.

The previous prime is 679090679. The next prime is 679090697. The reversal of 679090691 is 196090976.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679090691 is a prime.

It is a super-2 number, since 2×679090691² = 922328333205714962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (679090697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339545345 + 339545346.

It is an arithmetic number, because the mean of its divisors is an integer number (339545346).

Almost surely, 2^679090691 is an apocalyptic number.

679090691 is a deficient number, since it is larger than the sum of its proper divisors (1).

679090691 is an equidigital number, since it uses as much as digits as its factorization.

679090691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 679090691 is about 26059.3685840620. The cubic root of 679090691 is about 878.9737912729.

The spelling of 679090691 in words is "six hundred seventy-nine million, ninety thousand, six hundred ninety-one".