697983997 has 2 divisors, whose sum is σ = 697983998. Its totient is φ = 697983996.

The previous prime is 697983989. The next prime is 697984009. The reversal of 697983997 is 799389796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687960441 + 10023556 = 26229^2 + 3166^2 .

It is a cyclic number.

It is not a de Polignac number, because 697983997 - 2³ = 697983989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697983917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348991998 + 348991999.

It is an arithmetic number, because the mean of its divisors is an integer number (348991999).

Almost surely, 2^697983997 is an apocalyptic number.

It is an amenable number.

697983997 is a deficient number, since it is larger than the sum of its proper divisors (1).

697983997 is an equidigital number, since it uses as much as digits as its factorization.

697983997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46294416, while the sum is 67.

The square root of 697983997 is about 26419.3867642684. The cubic root of 697983997 is about 887.0507930259.

The spelling of 697983997 in words is "six hundred ninety-seven million, nine hundred eighty-three thousand, nine hundred ninety-seven".