155501279 has 2 divisors, whose sum is σ = 155501280. Its totient is φ = 155501278.

The previous prime is 155501273. The next prime is 155501341. The reversal of 155501279 is 972105551.

155501279 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155501279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155501273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77750639 + 77750640.

It is an arithmetic number, because the mean of its divisors is an integer number (77750640).

Almost surely, 2^155501279 is an apocalyptic number.

155501279 is a deficient number, since it is larger than the sum of its proper divisors (1).

155501279 is an equidigital number, since it uses as much as digits as its factorization.

155501279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 35.

The square root of 155501279 is about 12470.0151964623. The cubic root of 155501279 is about 537.7469904344.

The spelling of 155501279 in words is "one hundred fifty-five million, five hundred one thousand, two hundred seventy-nine".