670640231 has 2 divisors, whose sum is σ = 670640232. Its totient is φ = 670640230.

The previous prime is 670640203. The next prime is 670640237. The reversal of 670640231 is 132046076.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670640231 is a prime.

It is a super-2 number, since 2×670640231² = 899516638871466722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 670640194 and 670640203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670640237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335320115 + 335320116.

It is an arithmetic number, because the mean of its divisors is an integer number (335320116).

Almost surely, 2^670640231 is an apocalyptic number.

670640231 is a deficient number, since it is larger than the sum of its proper divisors (1).

670640231 is an equidigital number, since it uses as much as digits as its factorization.

670640231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 670640231 is about 25896.7223987902. The cubic root of 670640231 is about 875.3126419108.

The spelling of 670640231 in words is "six hundred seventy million, six hundred forty thousand, two hundred thirty-one".