697720291 has 2 divisors, whose sum is σ = 697720292. Its totient is φ = 697720290.

The previous prime is 697720267. The next prime is 697720297. The reversal of 697720291 is 192027796.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 697720291 - 2⁹ = 697719779 is a prime.

It is not a weakly prime, because it can be changed into another prime (697720297) 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, 348860145 + 348860146.

It is an arithmetic number, because the mean of its divisors is an integer number (348860146).

Almost surely, 2^697720291 is an apocalyptic number.

697720291 is a deficient number, since it is larger than the sum of its proper divisors (1).

697720291 is an equidigital number, since it uses as much as digits as its factorization.

697720291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 697720291 is about 26414.3955259249. The cubic root of 697720291 is about 886.9390664520.

The spelling of 697720291 in words is "six hundred ninety-seven million, seven hundred twenty thousand, two hundred ninety-one".