2172070631 has 4 divisors (see below), whose sum is σ = 2172851664. Its totient is φ = 2171289600.

The previous prime is 2172070627. The next prime is 2172070651. The reversal of 2172070631 is 1360702712.

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 2172070631 - 2² = 2172070627 is a prime.

It is a super-2 number, since 2×2172070631² = 9435781652105476322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2172070594 and 2172070603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172070651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386330 + ... + 391911.

It is an arithmetic number, because the mean of its divisors is an integer number (543212916).

Almost surely, 2^2172070631 is an apocalyptic number.

2172070631 is a deficient number, since it is larger than the sum of its proper divisors (781033).

2172070631 is an equidigital number, since it uses as much as digits as its factorization.

2172070631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781032.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 2172070631 is about 46605.4785513463. The cubic root of 2172070631 is about 1295.0642486870.

The spelling of 2172070631 in words is "two billion, one hundred seventy-two million, seventy thousand, six hundred thirty-one".