1255401555 has 32 divisors (see below), whose sum is σ = 2070503424. Its totient is φ = 649157376.

The previous prime is 1255401551. The next prime is 1255401557. The reversal of 1255401555 is 5551045521.

1255401555 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1255401555 - 2² = 1255401551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255401551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81262 + ... + 95468.

It is an arithmetic number, because the mean of its divisors is an integer number (64703232).

Almost surely, 2^1255401555 is an apocalyptic number.

1255401555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1255401555 is a deficient number, since it is larger than the sum of its proper divisors (815101869).

1255401555 is a wasteful number, since it uses less digits than its factorization.

1255401555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14395.

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

The square root of 1255401555 is about 35431.6462360980. The cubic root of 1255401555 is about 1078.7667550245.

The spelling of 1255401555 in words is "one billion, two hundred fifty-five million, four hundred one thousand, five hundred fifty-five".