672696991 has 2 divisors, whose sum is σ = 672696992. Its totient is φ = 672696990.

The previous prime is 672696979. The next prime is 672697019. The reversal of 672696991 is 199696276.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672696991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672696901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336348495 + 336348496.

It is an arithmetic number, because the mean of its divisors is an integer number (336348496).

Almost surely, 2^672696991 is an apocalyptic number.

672696991 is a deficient number, since it is larger than the sum of its proper divisors (1).

672696991 is an equidigital number, since it uses as much as digits as its factorization.

672696991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 55.

The square root of 672696991 is about 25936.4028153482. The cubic root of 672696991 is about 876.2065492770.

The spelling of 672696991 in words is "six hundred seventy-two million, six hundred ninety-six thousand, nine hundred ninety-one".