697699397 has 4 divisors (see below), whose sum is σ = 738740556. Its totient is φ = 656658240.

The previous prime is 697699393. The next prime is 697699441. The reversal of 697699397 is 793996796.

It is a Cunningham number, because it is equal to 26414²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 543169636 + 154529761 = 23306^2 + 12431^2 .

It is a cyclic number.

It is not a de Polignac number, because 697699397 - 2² = 697699393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697699393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20520554 + ... + 20520587.

It is an arithmetic number, because the mean of its divisors is an integer number (184685139).

Almost surely, 2^697699397 is an apocalyptic number.

It is an amenable number.

697699397 is a deficient number, since it is larger than the sum of its proper divisors (41041159).

697699397 is a wasteful number, since it uses less digits than its factorization.

697699397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41041158.

The product of its digits is 34720812, while the sum is 65.

The square root of 697699397 is about 26414.0000189294. Note that the first 4 decimals coincide. The cubic root of 697699397 is about 886.9302129090.

The spelling of 697699397 in words is "six hundred ninety-seven million, six hundred ninety-nine thousand, three hundred ninety-seven".