697123831 has 2 divisors, whose sum is σ = 697123832. Its totient is φ = 697123830.

The previous prime is 697123807. The next prime is 697123841. The reversal of 697123831 is 138321796.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 697123831 - 2¹¹ = 697121783 is a prime.

It is a super-2 number, since 2×697123831² = 971963271496233122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697123841) 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, 348561915 + 348561916.

It is an arithmetic number, because the mean of its divisors is an integer number (348561916).

Almost surely, 2^697123831 is an apocalyptic number.

697123831 is a deficient number, since it is larger than the sum of its proper divisors (1).

697123831 is an equidigital number, since it uses as much as digits as its factorization.

697123831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 697123831 is about 26403.1026775264. The cubic root of 697123831 is about 886.6862552597.

The spelling of 697123831 in words is "six hundred ninety-seven million, one hundred twenty-three thousand, eight hundred thirty-one".