697666031 has 2 divisors, whose sum is σ = 697666032. Its totient is φ = 697666030.

The previous prime is 697666019. The next prime is 697666049. The reversal of 697666031 is 130666796.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 697666031 - 2¹⁴ = 697649647 is a prime.

It is a super-2 number, since 2×697666031² = 973475781622585922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697666631) 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, 348833015 + 348833016.

It is an arithmetic number, because the mean of its divisors is an integer number (348833016).

Almost surely, 2^697666031 is an apocalyptic number.

697666031 is a deficient number, since it is larger than the sum of its proper divisors (1).

697666031 is an equidigital number, since it uses as much as digits as its factorization.

697666031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 697666031 is about 26413.3684144980. The cubic root of 697666031 is about 886.9160741623.

The spelling of 697666031 in words is "six hundred ninety-seven million, six hundred sixty-six thousand, thirty-one".