671091669 has 16 divisors (see below), whose sum is σ = 1017332800. Its totient is φ = 436989168.

The previous prime is 671091653. The next prime is 671091691. The reversal of 671091669 is 966190176.

It is not a de Polignac number, because 671091669 - 2⁴ = 671091653 is a prime.

It is a super-2 number, since 2×671091669² = 900728056402411122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671091569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287854 + ... + 290175.

It is an arithmetic number, because the mean of its divisors is an integer number (63583300).

Almost surely, 2^671091669 is an apocalyptic number.

It is an amenable number.

671091669 is a deficient number, since it is larger than the sum of its proper divisors (346241131).

671091669 is a wasteful number, since it uses less digits than its factorization.

671091669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578081 (or 578075 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 671091669 is about 25905.4370547960. The cubic root of 671091669 is about 875.5090019158.

The spelling of 671091669 in words is "six hundred seventy-one million, ninety-one thousand, six hundred sixty-nine".