671281919 has 12 divisors (see below), whose sum is σ = 851868648. Its totient is φ = 523076400.

The previous prime is 671281883. The next prime is 671281927. The reversal of 671281919 is 919182176.

It is not a de Polignac number, because 671281919 - 2¹² = 671277823 is a prime.

It is a super-2 number, since 2×671281919² = 901238829552645122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671281919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671281969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 622172 + ... + 623249.

It is an arithmetic number, because the mean of its divisors is an integer number (70989054).

Almost surely, 2^671281919 is an apocalyptic number.

671281919 is a deficient number, since it is larger than the sum of its proper divisors (180586729).

671281919 is a wasteful number, since it uses less digits than its factorization.

671281919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245446 (or 1245439 counting only the distinct ones).

The product of its digits is 54432, while the sum is 44.

The square root of 671281919 is about 25909.1088036621. The cubic root of 671281919 is about 875.5917277478.

The spelling of 671281919 in words is "six hundred seventy-one million, two hundred eighty-one thousand, nine hundred nineteen".