669571031 has 2 divisors, whose sum is σ = 669571032. Its totient is φ = 669571030.

The previous prime is 669571003. The next prime is 669571073. The reversal of 669571031 is 130175966.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669571031 is a prime.

It is a super-2 number, since 2×669571031² = 896650731108805922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669571081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334785515 + 334785516.

It is an arithmetic number, because the mean of its divisors is an integer number (334785516).

Almost surely, 2^669571031 is an apocalyptic number.

669571031 is a deficient number, since it is larger than the sum of its proper divisors (1).

669571031 is an equidigital number, since it uses as much as digits as its factorization.

669571031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 669571031 is about 25876.0706251935. The cubic root of 669571031 is about 874.8472249188.

The spelling of 669571031 in words is "six hundred sixty-nine million, five hundred seventy-one thousand, thirty-one".