155885381 has 4 divisors (see below), whose sum is σ = 155996352. Its totient is φ = 155774412.

The previous prime is 155885377. The next prime is 155885383. The reversal of 155885381 is 183588551.

155885381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 155885381 - 2² = 155885377 is a prime.

It is a super-2 number, since 2×155885381² = 48600504019030322, 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 (155885383) 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, 53351 + ... + 56196.

It is an arithmetic number, because the mean of its divisors is an integer number (38999088).

Almost surely, 2^155885381 is an apocalyptic number.

It is an amenable number.

155885381 is a deficient number, since it is larger than the sum of its proper divisors (110971).

155885381 is a wasteful number, since it uses less digits than its factorization.

155885381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110970.

The product of its digits is 192000, while the sum is 44.

The square root of 155885381 is about 12485.4067214488. The cubic root of 155885381 is about 538.1893873575.

The spelling of 155885381 in words is "one hundred fifty-five million, eight hundred eighty-five thousand, three hundred eighty-one".