231553115 has 4 divisors (see below), whose sum is σ = 277863744. Its totient is φ = 185242488.

The previous prime is 231553109. The next prime is 231553123. The reversal of 231553115 is 511355132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231553115 - 2⁴ = 231553099 is a prime.

It is a super-4 number, since 4×231553115⁴ (a number of 35 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23155307 + ... + 23155316.

It is an arithmetic number, because the mean of its divisors is an integer number (69465936).

Almost surely, 2^231553115 is an apocalyptic number.

231553115 is a deficient number, since it is larger than the sum of its proper divisors (46310629).

231553115 is an equidigital number, since it uses as much as digits as its factorization.

231553115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46310628.

The product of its digits is 2250, while the sum is 26.

The square root of 231553115 is about 15216.8694217963. The cubic root of 231553115 is about 614.0685792745.

The spelling of 231553115 in words is "two hundred thirty-one million, five hundred fifty-three thousand, one hundred fifteen".