231215667 has 8 divisors (see below), whose sum is σ = 310357200. Its totient is φ = 153108960.

The previous prime is 231215659. The next prime is 231215669. The reversal of 231215667 is 766512132.

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

It is not a de Polignac number, because 231215667 - 2³ = 231215659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231215669) 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, 258184 + ... + 259077.

It is an arithmetic number, because the mean of its divisors is an integer number (38794650).

Almost surely, 2^231215667 is an apocalyptic number.

231215667 is a deficient number, since it is larger than the sum of its proper divisors (79141533).

231215667 is a wasteful number, since it uses less digits than its factorization.

231215667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517413.

The product of its digits is 15120, while the sum is 33.

The square root of 231215667 is about 15205.7774217565. Note that the first 3 decimals coincide. The cubic root of 231215667 is about 613.7701352135.

Adding to 231215667 its reverse (766512132), we get a palindrome (997727799).

The spelling of 231215667 in words is "two hundred thirty-one million, two hundred fifteen thousand, six hundred sixty-seven".