155115379 has 2 divisors, whose sum is σ = 155115380. Its totient is φ = 155115378.

The previous prime is 155115377. The next prime is 155115409. The reversal of 155115379 is 973511551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155115379 - 2¹ = 155115377 is a prime.

Together with 155115377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155115377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77557689 + 77557690.

It is an arithmetic number, because the mean of its divisors is an integer number (77557690).

Almost surely, 2^155115379 is an apocalyptic number.

155115379 is a deficient number, since it is larger than the sum of its proper divisors (1).

155115379 is an equidigital number, since it uses as much as digits as its factorization.

155115379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23625, while the sum is 37.

The square root of 155115379 is about 12454.5324681419. The cubic root of 155115379 is about 537.3017883900.

The spelling of 155115379 in words is "one hundred fifty-five million, one hundred fifteen thousand, three hundred seventy-nine".