155120505 has 16 divisors (see below), whose sum is σ = 249583680. Its totient is φ = 82267328.

The previous prime is 155120501. The next prime is 155120509. The reversal of 155120505 is 505021551.

It is an interprime number because it is at equal distance from previous prime (155120501) and next prime (155120509).

It is a cyclic number.

It is not a de Polignac number, because 155120505 - 2² = 155120501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155120501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26202 + ... + 31571.

It is an arithmetic number, because the mean of its divisors is an integer number (15598980).

Almost surely, 2^155120505 is an apocalyptic number.

155120505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155120505 is a deficient number, since it is larger than the sum of its proper divisors (94463175).

155120505 is a wasteful number, since it uses less digits than its factorization.

155120505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57960.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 155120505 is about 12454.7382549775. The cubic root of 155120505 is about 537.3077069491.

The spelling of 155120505 in words is "one hundred fifty-five million, one hundred twenty thousand, five hundred five".