231513151 has 4 divisors (see below), whose sum is σ = 231929352. Its totient is φ = 231096952.

The previous prime is 231513143. The next prime is 231513187. The reversal of 231513151 is 151315132.

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 231513151 - 2³ = 231513143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231513851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207265 + ... + 208378.

It is an arithmetic number, because the mean of its divisors is an integer number (57982338).

Almost surely, 2^231513151 is an apocalyptic number.

231513151 is a deficient number, since it is larger than the sum of its proper divisors (416201).

231513151 is an equidigital number, since it uses as much as digits as its factorization.

231513151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416200.

The product of its digits is 450, while the sum is 22.

The square root of 231513151 is about 15215.5562172403. The cubic root of 231513151 is about 614.0332496574.

Adding to 231513151 its reverse (151315132), we get a palindrome (382828283).

The spelling of 231513151 in words is "two hundred thirty-one million, five hundred thirteen thousand, one hundred fifty-one".