2113731 has 24 divisors (see below), whose sum is σ = 3294720. Its totient is φ = 1301616.

The previous prime is 2113703. The next prime is 2113733. The reversal of 2113731 is 1373112.

It is not a de Polignac number, because 2113731 - 2⁶ = 2113667 is a prime.

It is a super-2 number, since 2×2113731² = 8935717480722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113733) 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, 7906 + ... + 8168.

It is an arithmetic number, because the mean of its divisors is an integer number (137280).

2^2113731 is an apocalyptic number.

2113731 is a deficient number, since it is larger than the sum of its proper divisors (1180989).

2113731 is a wasteful number, since it uses less digits than its factorization.

2113731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 332 counting only the distinct ones).

The product of its digits is 126, while the sum is 18.

The square root of 2113731 is about 1453.8676005744. The cubic root of 2113731 is about 128.3364156603.

Adding to 2113731 its reverse (1373112), we get a palindrome (3486843).

The spelling of 2113731 in words is "two million, one hundred thirteen thousand, seven hundred thirty-one".