670342891 has 2 divisors, whose sum is σ = 670342892. Its totient is φ = 670342890.

The previous prime is 670342873. The next prime is 670342901. The reversal of 670342891 is 198243076.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 670342891 - 2¹⁹ = 669818603 is a prime.

It is equal to p_34795309 and since 670342891 and 34795309 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (670342091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335171445 + 335171446.

It is an arithmetic number, because the mean of its divisors is an integer number (335171446).

Almost surely, 2^670342891 is an apocalyptic number.

670342891 is a deficient number, since it is larger than the sum of its proper divisors (1).

670342891 is an equidigital number, since it uses as much as digits as its factorization.

670342891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 670342891 is about 25890.9808813803. The cubic root of 670342891 is about 875.1832610979.

It can be divided in two parts, 6703 and 42891, that added together give a palindrome (49594).

The spelling of 670342891 in words is "six hundred seventy million, three hundred forty-two thousand, eight hundred ninety-one".