471691981 has 8 divisors (see below), whose sum is σ = 492523200. Its totient is φ = 450887712.

The previous prime is 471691951. The next prime is 471691991. The reversal of 471691981 is 189196174.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 471691981 - 2¹³ = 471683789 is a prime.

It is a super-2 number, since 2×471691981² = 444986649879408722, 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 (471691951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34470 + ... + 46168.

It is an arithmetic number, because the mean of its divisors is an integer number (61565400).

Almost surely, 2^471691981 is an apocalyptic number.

It is an amenable number.

471691981 is a deficient number, since it is larger than the sum of its proper divisors (20831219).

471691981 is a wasteful number, since it uses less digits than its factorization.

471691981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13475.

The product of its digits is 108864, while the sum is 46.

The square root of 471691981 is about 21718.4709636751. The cubic root of 471691981 is about 778.4298795308.

The spelling of 471691981 in words is "four hundred seventy-one million, six hundred ninety-one thousand, nine hundred eighty-one".