671670407 has 2 divisors, whose sum is σ = 671670408. Its totient is φ = 671670406.

The previous prime is 671670383. The next prime is 671670427. The reversal of 671670407 is 704076176.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671670407 is a prime.

It is a super-2 number, since 2×671670407² = 902282271279091298, which contains 22 as substring.

It is a Chen prime.

It is equal to p_34860566 and since 671670407 and 34860566 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671670427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335835203 + 335835204.

It is an arithmetic number, because the mean of its divisors is an integer number (335835204).

Almost surely, 2^671670407 is an apocalyptic number.

671670407 is a deficient number, since it is larger than the sum of its proper divisors (1).

671670407 is an equidigital number, since it uses as much as digits as its factorization.

671670407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 671670407 is about 25916.6048509445. The cubic root of 671670407 is about 875.7606042767.

The spelling of 671670407 in words is "six hundred seventy-one million, six hundred seventy thousand, four hundred seven".