155057919 has 4 divisors (see below), whose sum is σ = 206743896. Its totient is φ = 103371944.

The previous prime is 155057911. The next prime is 155057963. The reversal of 155057919 is 919750551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155057919 - 2³ = 155057911 is a prime.

It is a super-2 number, since 2×155057919² = 48085916489221122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155057911) 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, 25842984 + ... + 25842989.

It is an arithmetic number, because the mean of its divisors is an integer number (51685974).

Almost surely, 2^155057919 is an apocalyptic number.

155057919 is a deficient number, since it is larger than the sum of its proper divisors (51685977).

155057919 is an equidigital number, since it uses as much as digits as its factorization.

155057919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51685976.

The product of its (nonzero) digits is 70875, while the sum is 42.

The square root of 155057919 is about 12452.2254637474. The cubic root of 155057919 is about 537.2354352578.

The spelling of 155057919 in words is "one hundred fifty-five million, fifty-seven thousand, nine hundred nineteen".