2159631 has 12 divisors (see below), whose sum is σ = 3255408. Its totient is φ = 1377024.

The previous prime is 2159627. The next prime is 2159639. The reversal of 2159631 is 1369512.

2159631 is a `hidden beast` number, since 21 + 5 + 9 + 631 = 666.

It is not a de Polignac number, because 2159631 - 2² = 2159627 is a prime.

It is a super-2 number, since 2×2159631² = 9328012112322, which contains 22 as substring.

2159631 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2159595 and 2159604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159639) 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, 5010 + ... + 5423.

It is an arithmetic number, because the mean of its divisors is an integer number (271284).

2^2159631 is an apocalyptic number.

2159631 is a deficient number, since it is larger than the sum of its proper divisors (1095777).

2159631 is a wasteful number, since it uses less digits than its factorization.

2159631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10462 (or 10459 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 2159631 is about 1469.5683039587. The cubic root of 2159631 is about 129.2587199975.

The spelling of 2159631 in words is "two million, one hundred fifty-nine thousand, six hundred thirty-one".