155515379 has 4 divisors (see below), whose sum is σ = 156384360. Its totient is φ = 154646400.

The previous prime is 155515363. The next prime is 155515387. The reversal of 155515379 is 973515551.

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 155515379 - 2⁴ = 155515363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155515309) 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, 434222 + ... + 434579.

It is an arithmetic number, because the mean of its divisors is an integer number (39096090).

Almost surely, 2^155515379 is an apocalyptic number.

155515379 is a deficient number, since it is larger than the sum of its proper divisors (868981).

155515379 is an equidigital number, since it uses as much as digits as its factorization.

155515379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868980.

The product of its digits is 118125, while the sum is 41.

The square root of 155515379 is about 12470.5805398145. The cubic root of 155515379 is about 537.7632432555.

The spelling of 155515379 in words is "one hundred fifty-five million, five hundred fifteen thousand, three hundred seventy-nine".