151231 has 4 divisors (see below), whose sum is σ = 154792. Its totient is φ = 147672.

The previous prime is 151213. The next prime is 151237. The reversal of 151231 is 132151.

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 151231 - 2¹¹ = 149183 is a prime.

It is a super-2 number, since 2×151231² = 45741630722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1716 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (38698).

2¹⁵¹²³¹ is an apocalyptic number.

151231 is a deficient number, since it is larger than the sum of its proper divisors (3561).

151231 is an equidigital number, since it uses as much as digits as its factorization.

151231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560.

The product of its digits is 30, while the sum is 13.

The square root of 151231 is about 388.8843015602. The cubic root of 151231 is about 53.2778807320.

Adding to 151231 its reverse (132151), we get a palindrome (283382).

The spelling of 151231 in words is "one hundred fifty-one thousand, two hundred thirty-one".