694898021 has 4 divisors (see below), whose sum is σ = 696280032. Its totient is φ = 693516012.

The previous prime is 694897979. The next prime is 694898041. The reversal of 694898021 is 120898496.

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 694898021 - 2¹⁰ = 694896997 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 (694898041) 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, 690251 + ... + 691256.

It is an arithmetic number, because the mean of its divisors is an integer number (174070008).

Almost surely, 2^694898021 is an apocalyptic number.

It is an amenable number.

694898021 is a deficient number, since it is larger than the sum of its proper divisors (1382011).

694898021 is a wasteful number, since it uses less digits than its factorization.

694898021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382010.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 694898021 is about 26360.9184399937. The cubic root of 694898021 is about 885.7415644973.

The spelling of 694898021 in words is "six hundred ninety-four million, eight hundred ninety-eight thousand, twenty-one".