151881 has 4 divisors (see below), whose sum is σ = 202512. Its totient is φ = 101252.

The previous prime is 151871. The next prime is 151883. The reversal of 151881 is 188151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 151881 - 2⁵ = 151849 is a prime.

It is a super-2 number, since 2×151881² = 46135676322, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

151881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (151883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25311 + ... + 25316.

It is an arithmetic number, because the mean of its divisors is an integer number (50628).

2¹⁵¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

151881 is a deficient number, since it is larger than the sum of its proper divisors (50631).

151881 is an equidigital number, since it uses as much as digits as its factorization.

151881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50630.

The product of its digits is 320, while the sum is 24.

The square root of 151881 is about 389.7191296306. The cubic root of 151881 is about 53.3541021543.

The spelling of 151881 in words is "one hundred fifty-one thousand, eight hundred eighty-one".