231261151 has 4 divisors (see below), whose sum is σ = 252284904. Its totient is φ = 210237400.

The previous prime is 231261143. The next prime is 231261227. The reversal of 231261151 is 151162132.

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 231261151 - 2³ = 231261143 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231261131) 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, 10511860 + ... + 10511881.

It is an arithmetic number, because the mean of its divisors is an integer number (63071226).

Almost surely, 2^231261151 is an apocalyptic number.

231261151 is a deficient number, since it is larger than the sum of its proper divisors (21023753).

231261151 is a wasteful number, since it uses less digits than its factorization.

231261151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21023752.

The product of its digits is 360, while the sum is 22.

The square root of 231261151 is about 15207.2729639472. The cubic root of 231261151 is about 613.8103788683.

The spelling of 231261151 in words is "two hundred thirty-one million, two hundred sixty-one thousand, one hundred fifty-one".