155983281 has 4 divisors (see below), whose sum is σ = 207977712. Its totient is φ = 103988852.

The previous prime is 155983273. The next prime is 155983301. The reversal of 155983281 is 182389551.

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 155983281 - 2³ = 155983273 is a prime.

It is a super-2 number, since 2×155983281² = 48661567903049922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155981281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25997211 + ... + 25997216.

It is an arithmetic number, because the mean of its divisors is an integer number (51994428).

Almost surely, 2^155983281 is an apocalyptic number.

It is an amenable number.

155983281 is a deficient number, since it is larger than the sum of its proper divisors (51994431).

155983281 is an equidigital number, since it uses as much as digits as its factorization.

155983281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51994430.

The product of its digits is 86400, while the sum is 42.

The square root of 155983281 is about 12489.3266832124. The cubic root of 155983281 is about 538.3020293397.

The spelling of 155983281 in words is "one hundred fifty-five million, nine hundred eighty-three thousand, two hundred eighty-one".