671004081 has 20 divisors (see below), whose sum is σ = 1093489584. Its totient is φ = 406668600.

The previous prime is 671004077. The next prime is 671004097. The reversal of 671004081 is 180400176.

It is a happy number.

It is not a de Polignac number, because 671004081 - 2² = 671004077 is a prime.

It is a super-2 number, since 2×671004081² = 900492953437309122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (671004041) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 375655 + ... + 377436.

Almost surely, 2^671004081 is an apocalyptic number.

It is an amenable number.

671004081 is a deficient number, since it is larger than the sum of its proper divisors (422485503).

671004081 is a wasteful number, since it uses less digits than its factorization.

671004081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753114 (or 753105 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 671004081 is about 25903.7464664863. The cubic root of 671004081 is about 875.4709110347.

The spelling of 671004081 in words is "six hundred seventy-one million, four thousand, eighty-one".