2170631 has 4 divisors (see below), whose sum is σ = 2183352. Its totient is φ = 2157912.

The previous prime is 2170627. The next prime is 2170639. The reversal of 2170631 is 1360712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2170631 - 2² = 2170627 is a prime.

It is a super-2 number, since 2×2170631² = 9423277876322, 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 (2170639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6101 + ... + 6446.

It is an arithmetic number, because the mean of its divisors is an integer number (545838).

2^2170631 is an apocalyptic number.

2170631 is a deficient number, since it is larger than the sum of its proper divisors (12721).

2170631 is a wasteful number, since it uses less digits than its factorization.

2170631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12720.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 2170631 is about 1473.3061460538. The cubic root of 2170631 is about 129.4778066051.

The spelling of 2170631 in words is "two million, one hundred seventy thousand, six hundred thirty-one".