145251555 has 16 divisors (see below), whose sum is σ = 242507520. Its totient is φ = 74099168.

The previous prime is 145251539. The next prime is 145251629. The reversal of 145251555 is 555152541.

It is a cyclic number.

It is not a de Polignac number, because 145251555 - 2⁴ = 145251539 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210165 + ... + 210854.

It is an arithmetic number, because the mean of its divisors is an integer number (15156720).

Almost surely, 2^145251555 is an apocalyptic number.

145251555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145251555 is a deficient number, since it is larger than the sum of its proper divisors (97255965).

145251555 is a wasteful number, since it uses less digits than its factorization.

145251555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421050.

The product of its digits is 25000, while the sum is 33.

The square root of 145251555 is about 12052.0353052918. The cubic root of 145251555 is about 525.6624200741.

The spelling of 145251555 in words is "one hundred forty-five million, two hundred fifty-one thousand, five hundred fifty-five".