145881 has 10 divisors (see below), whose sum is σ = 218042. Its totient is φ = 97200.

The previous prime is 145879. The next prime is 145897. The reversal of 145881 is 188541.

It can be written as a sum of positive squares in only one way, i.e., 99225 + 46656 = 315^2 + 216^2 .

It is not a de Polignac number, because 145881 - 2¹ = 145879 is a prime.

It is a super-2 number, since 2×145881² = 42562532322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

145881 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 145881.

It is not an unprimeable number, because it can be changed into a prime (145861) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 820 + ... + 981.

2¹⁴⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

145881 is a deficient number, since it is larger than the sum of its proper divisors (72161).

145881 is an equidigital number, since it uses as much as digits as its factorization.

145881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813 (or 1804 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 145881 is about 381.9437131306. The cubic root of 145881 is about 52.6420642092.

The spelling of 145881 in words is "one hundred forty-five thousand, eight hundred eighty-one".