155914381 has 4 divisors (see below), whose sum is σ = 178187872. Its totient is φ = 133640892.

The previous prime is 155914379. The next prime is 155914397. The reversal of 155914381 is 183419551.

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, and also an emirpimes, since its reverse is a distinct semiprime: 183419551 = 7 ⋅26202793.

It is not a de Polignac number, because 155914381 - 2¹ = 155914379 is a prime.

It is a super-2 number, since 2×155914381² = 48618588405226322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155914381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155914331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11136735 + ... + 11136748.

It is an arithmetic number, because the mean of its divisors is an integer number (44546968).

Almost surely, 2^155914381 is an apocalyptic number.

It is an amenable number.

155914381 is a deficient number, since it is larger than the sum of its proper divisors (22273491).

155914381 is an equidigital number, since it uses as much as digits as its factorization.

155914381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22273490.

The product of its digits is 21600, while the sum is 37.

The square root of 155914381 is about 12486.5680232801. The cubic root of 155914381 is about 538.2227591516. Note that the first 3 decimals are identical.

The spelling of 155914381 in words is "one hundred fifty-five million, nine hundred fourteen thousand, three hundred eighty-one".