691696297 has 2 divisors, whose sum is σ = 691696298. Its totient is φ = 691696296.

The previous prime is 691696253. The next prime is 691696303. The reversal of 691696297 is 792696196.

691696297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 524226816 + 167469481 = 22896^2 + 12941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691696297 is a prime.

It is not a weakly prime, because it can be changed into another prime (691690297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345848148 + 345848149.

It is an arithmetic number, because the mean of its divisors is an integer number (345848149).

Almost surely, 2^691696297 is an apocalyptic number.

It is an amenable number.

691696297 is a deficient number, since it is larger than the sum of its proper divisors (1).

691696297 is an equidigital number, since it uses as much as digits as its factorization.

691696297 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 691696297 is about 26300.1197145564. The cubic root of 691696297 is about 884.3791263810.

It can be divided in two parts, 69169 and 6297, that added together give a triangular number (75466 = T₃₈₈).

The spelling of 691696297 in words is "six hundred ninety-one million, six hundred ninety-six thousand, two hundred ninety-seven".