231215331 has 8 divisors (see below), whose sum is σ = 316619344. Its totient is φ = 149977440.

The previous prime is 231215323. The next prime is 231215339. The reversal of 231215331 is 133512132.

It is an interprime number because it is at equal distance from previous prime (231215323) and next prime (231215339).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231215331 - 2³ = 231215323 is a prime.

It is a super-2 number, since 2×231215331² = 106921058578879122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231215298 and 231215307.

It is not an unprimeable number, because it can be changed into a prime (231215339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1041400 + ... + 1041621.

It is an arithmetic number, because the mean of its divisors is an integer number (39577418).

Almost surely, 2^231215331 is an apocalyptic number.

231215331 is a deficient number, since it is larger than the sum of its proper divisors (85404013).

231215331 is a wasteful number, since it uses less digits than its factorization.

231215331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083061.

The product of its digits is 540, while the sum is 21.

The square root of 231215331 is about 15205.7663733204. The cubic root of 231215331 is about 613.7698379054.

Adding to 231215331 its reverse (133512132), we get a palindrome (364727463).

The spelling of 231215331 in words is "two hundred thirty-one million, two hundred fifteen thousand, three hundred thirty-one".