345566831 has 2 divisors, whose sum is σ = 345566832. Its totient is φ = 345566830.

The previous prime is 345566807. The next prime is 345566843. The reversal of 345566831 is 138665543.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345566831 is a prime.

It is a super-2 number, since 2×345566831² = 238832869374765122, 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 (345566801) 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, 172783415 + 172783416.

It is an arithmetic number, because the mean of its divisors is an integer number (172783416).

Almost surely, 2^345566831 is an apocalyptic number.

345566831 is a deficient number, since it is larger than the sum of its proper divisors (1).

345566831 is an equidigital number, since it uses as much as digits as its factorization.

345566831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 41.

The square root of 345566831 is about 18589.4279363298. The cubic root of 345566831 is about 701.7418058175.

The spelling of 345566831 in words is "three hundred forty-five million, five hundred sixty-six thousand, eight hundred thirty-one".