2158171631 has 24 divisors (see below), whose sum is σ = 2812802256. Its totient is φ = 1636225920.

The previous prime is 2158171583. The next prime is 2158171633. The reversal of 2158171631 is 1361718512.

It is not a de Polignac number, because 2158171631 - 2⁶ = 2158171567 is a prime.

It is a super-2 number, since 2×2158171631² = 9315409577706400322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2158171591 and 2158171600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158171633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34166 + ... + 74051.

It is an arithmetic number, because the mean of its divisors is an integer number (117200094).

Almost surely, 2^2158171631 is an apocalyptic number.

2158171631 is a deficient number, since it is larger than the sum of its proper divisors (654630625).

2158171631 is a wasteful number, since it uses less digits than its factorization.

2158171631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108279 (or 108272 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 2158171631 is about 46456.1258716221. The cubic root of 2158171631 is about 1292.2959794300.

The spelling of 2158171631 in words is "two billion, one hundred fifty-eight million, one hundred seventy-one thousand, six hundred thirty-one".