1831213131 has 16 divisors (see below), whose sum is σ = 2678987520. Its totient is φ = 1103407520.

The previous prime is 1831213117. The next prime is 1831213133. The reversal of 1831213131 is 1313121381.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1831213131 - 2⁵ = 1831213099 is a prime.

It is a super-2 number, since 2×1831213131² = 6706683062293646322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1831213133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154671 + ... + 166088.

It is an arithmetic number, because the mean of its divisors is an integer number (167436720).

Almost surely, 2^1831213131 is an apocalyptic number.

1831213131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1831213131 is a deficient number, since it is larger than the sum of its proper divisors (847774389).

1831213131 is a wasteful number, since it uses less digits than its factorization.

1831213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320946.

The product of its digits is 432, while the sum is 24.

The square root of 1831213131 is about 42792.6761373953. The cubic root of 1831213131 is about 1223.4314241908.

The spelling of 1831213131 in words is "one billion, eight hundred thirty-one million, two hundred thirteen thousand, one hundred thirty-one".