155919959 has 4 divisors (see below), whose sum is σ = 167913816. Its totient is φ = 143926104.

The previous prime is 155919943. The next prime is 155919983. The reversal of 155919959 is 959919551.

155919959 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 an emirpimes, since its reverse is a distinct semiprime: 959919551 = 163 ⋅5889077.

It is a cyclic number.

It is not a de Polignac number, because 155919959 - 2⁴ = 155919943 is a prime.

It is a super-2 number, since 2×155919959² = 48622067229123362, 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 155919959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155919559) 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, 5996909 + ... + 5996934.

It is an arithmetic number, because the mean of its divisors is an integer number (41978454).

Almost surely, 2^155919959 is an apocalyptic number.

155919959 is a deficient number, since it is larger than the sum of its proper divisors (11993857).

155919959 is a wasteful number, since it uses less digits than its factorization.

155919959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11993856.

The product of its digits is 820125, while the sum is 53.

The square root of 155919959 is about 12486.7913812957. The cubic root of 155919959 is about 538.2291775690.

The spelling of 155919959 in words is "one hundred fifty-five million, nine hundred nineteen thousand, nine hundred fifty-nine".