669245231 has 2 divisors, whose sum is σ = 669245232. Its totient is φ = 669245230.

The previous prime is 669245183. The next prime is 669245251. The reversal of 669245231 is 132542966.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669245231 is a prime.

It is a super-2 number, since 2×669245231² = 895778358432486722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669245251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334622615 + 334622616.

It is an arithmetic number, because the mean of its divisors is an integer number (334622616).

Almost surely, 2^669245231 is an apocalyptic number.

669245231 is a deficient number, since it is larger than the sum of its proper divisors (1).

669245231 is an equidigital number, since it uses as much as digits as its factorization.

669245231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 669245231 is about 25869.7744675132. The cubic root of 669245231 is about 874.7053074551.

The spelling of 669245231 in words is "six hundred sixty-nine million, two hundred forty-five thousand, two hundred thirty-one".