669694031 has 2 divisors, whose sum is σ = 669694032. Its totient is φ = 669694030.

The previous prime is 669694021. The next prime is 669694033. The reversal of 669694031 is 130496966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669694031 - 2¹⁴ = 669677647 is a prime.

It is a super-2 number, since 2×669694031² = 896980190314057922, which contains 22 as substring.

Together with 669694033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669694033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334847015 + 334847016.

It is an arithmetic number, because the mean of its divisors is an integer number (334847016).

Almost surely, 2^669694031 is an apocalyptic number.

669694031 is a deficient number, since it is larger than the sum of its proper divisors (1).

669694031 is an equidigital number, since it uses as much as digits as its factorization.

669694031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 669694031 is about 25878.4472293065. The cubic root of 669694031 is about 874.9007913643.

The spelling of 669694031 in words is "six hundred sixty-nine million, six hundred ninety-four thousand, thirty-one".