697705921 has 4 divisors (see below), whose sum is σ = 761133744. Its totient is φ = 634278100.

The previous prime is 697705903. The next prime is 697705927. The reversal of 697705921 is 129507796.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 697705921 - 2⁵ = 697705889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697705927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31713895 + ... + 31713916.

It is an arithmetic number, because the mean of its divisors is an integer number (190283436).

Almost surely, 2^697705921 is an apocalyptic number.

It is an amenable number.

697705921 is a deficient number, since it is larger than the sum of its proper divisors (63427823).

697705921 is a wasteful number, since it uses less digits than its factorization.

697705921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63427822.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 697705921 is about 26414.1235137568. The cubic root of 697705921 is about 886.9329773826.

The spelling of 697705921 in words is "six hundred ninety-seven million, seven hundred five thousand, nine hundred twenty-one".