155085919 has 4 divisors (see below), whose sum is σ = 155111760. Its totient is φ = 155060080.

The previous prime is 155085913. The next prime is 155085937. The reversal of 155085919 is 919580551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919580551 = 61 ⋅15075091.

It is a cyclic number.

It is not a de Polignac number, because 155085919 - 2²³ = 146697311 is a prime.

It is a super-2 number, since 2×155085919² = 48103284544149122, 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 (155085913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1299 + ... + 17659.

It is an arithmetic number, because the mean of its divisors is an integer number (38777940).

Almost surely, 2^155085919 is an apocalyptic number.

155085919 is a deficient number, since it is larger than the sum of its proper divisors (25841).

155085919 is an equidigital number, since it uses as much as digits as its factorization.

155085919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25840.

The product of its (nonzero) digits is 81000, while the sum is 43.

The square root of 155085919 is about 12453.3497100178. The cubic root of 155085919 is about 537.2677708886.

The spelling of 155085919 in words is "one hundred fifty-five million, eighty-five thousand, nine hundred nineteen".