155881 has 8 divisors (see below), whose sum is σ = 175104. Its totient is φ = 137520.

The previous prime is 155863. The next prime is 155887. The reversal of 155881 is 188551.

155881 = 114² + 115² + ... + 124².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155881 - 2⁵ = 155849 is a prime.

It is a super-2 number, since 2×155881² = 48597772322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216 + ... + 598.

It is an arithmetic number, because the mean of its divisors is an integer number (21888).

2¹⁵⁵⁸⁸¹ is an apocalyptic number.

155881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155881 is a deficient number, since it is larger than the sum of its proper divisors (19223).

155881 is a wasteful number, since it uses less digits than its factorization.

155881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431.

The product of its digits is 1600, while the sum is 28.

The square root of 155881 is about 394.8176794420. The cubic root of 155881 is about 53.8184345555.

The spelling of 155881 in words is "one hundred fifty-five thousand, eight hundred eighty-one".