694912991 has 2 divisors, whose sum is σ = 694912992. Its totient is φ = 694912990.

The previous prime is 694912951. The next prime is 694913003. The reversal of 694912991 is 199219496.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-694912991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (694912921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347456495 + 347456496.

It is an arithmetic number, because the mean of its divisors is an integer number (347456496).

Almost surely, 2^694912991 is an apocalyptic number.

694912991 is a deficient number, since it is larger than the sum of its proper divisors (1).

694912991 is an equidigital number, since it uses as much as digits as its factorization.

694912991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 50.

The square root of 694912991 is about 26361.2023815303. The cubic root of 694912991 is about 885.7479248819.

The spelling of 694912991 in words is "six hundred ninety-four million, nine hundred twelve thousand, nine hundred ninety-one".