155030779 has 2 divisors, whose sum is σ = 155030780. Its totient is φ = 155030778.

The previous prime is 155030753. The next prime is 155030797. The reversal of 155030779 is 977030551.

It is a happy number.

Together with next prime (155030797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155030779 - 2²⁵ = 121476347 is a prime.

It is not a weakly prime, because it can be changed into another prime (155030719) 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 as a sum of consecutive naturals, namely, 77515389 + 77515390.

It is an arithmetic number, because the mean of its divisors is an integer number (77515390).

Almost surely, 2^155030779 is an apocalyptic number.

155030779 is a deficient number, since it is larger than the sum of its proper divisors (1).

155030779 is an equidigital number, since it uses as much as digits as its factorization.

155030779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33075, while the sum is 37.

The square root of 155030779 is about 12451.1356510159. The cubic root of 155030779 is about 537.2040890775.

The spelling of 155030779 in words is "one hundred fifty-five million, thirty thousand, seven hundred seventy-nine".