231201131 has 16 divisors (see below), whose sum is σ = 278568960. Its totient is φ = 187691040.

The previous prime is 231201119. The next prime is 231201143. The reversal of 231201131 is 131102132.

It is an interprime number because it is at equal distance from previous prime (231201119) and next prime (231201143).

It is a cyclic number.

It is not a de Polignac number, because 231201131 - 2¹⁴ = 231184747 is a prime.

It is a super-2 number, since 2×231201131² = 106907925951358322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231201151) 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, 1136 + ... + 21533.

It is an arithmetic number, because the mean of its divisors is an integer number (17410560).

Almost surely, 2^231201131 is an apocalyptic number.

231201131 is a deficient number, since it is larger than the sum of its proper divisors (47367829).

231201131 is a wasteful number, since it uses less digits than its factorization.

231201131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22754.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 231201131 is about 15205.2994380249. The cubic root of 231201131 is about 613.7572728359.

Adding to 231201131 its reverse (131102132), we get a palindrome (362303263).

The spelling of 231201131 in words is "two hundred thirty-one million, two hundred one thousand, one hundred thirty-one".