231133131 has 6 divisors (see below), whose sum is σ = 333858980. Its totient is φ = 154088748.

The previous prime is 231133109. The next prime is 231133153. The reversal of 231133131 is 131331132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231133109) and next prime (231133153).

It is not a de Polignac number, because 231133131 - 2¹³ = 231124939 is a prime.

It is a super-2 number, since 2×231133131² = 106845048491726322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231135131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12840721 + ... + 12840738.

Almost surely, 2^231133131 is an apocalyptic number.

231133131 is a deficient number, since it is larger than the sum of its proper divisors (102725849).

231133131 is a wasteful number, since it uses less digits than its factorization.

231133131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25681465 (or 25681462 counting only the distinct ones).

The product of its digits is 162, while the sum is 18.

The square root of 231133131 is about 15203.0632110769. The cubic root of 231133131 is about 613.6970949485.

Adding to 231133131 its reverse (131331132), we get a palindrome (362464263).

It can be divided in two parts, 23113 and 3131, that added together give a square (26244 = 162²).

The spelling of 231133131 in words is "two hundred thirty-one million, one hundred thirty-three thousand, one hundred thirty-one".