697979797 has 2 divisors, whose sum is σ = 697979798. Its totient is φ = 697979796.

The previous prime is 697979759. The next prime is 697979861. The reversal of 697979797 is 797979796.

It is a happy number.

697979797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 669826161 + 28153636 = 25881^2 + 5306^2 .

It is a cyclic number.

It is not a de Polignac number, because 697979797 - 2¹⁹ = 697455509 is a prime.

It is a super-2 number, since 2×697979797² = 974351594040322418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697979747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348989898 + 348989899.

It is an arithmetic number, because the mean of its divisors is an integer number (348989899).

Almost surely, 2^697979797 is an apocalyptic number.

It is an amenable number.

697979797 is a deficient number, since it is larger than the sum of its proper divisors (1).

697979797 is an equidigital number, since it uses as much as digits as its factorization.

697979797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94517766, while the sum is 70.

The square root of 697979797 is about 26419.3072770654. The cubic root of 697979797 is about 887.0490137966.

Subtracting 697979797 from its reverse (797979796), we obtain a palindrome (99999999).

The spelling of 697979797 in words is "six hundred ninety-seven million, nine hundred seventy-nine thousand, seven hundred ninety-seven".