1255421555 has 8 divisors (see below), whose sum is σ = 1510775712. Its totient is φ = 1001490688.

The previous prime is 1255421551. The next prime is 1255421569. The reversal of 1255421555 is 5551245521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1255421555 - 2² = 1255421551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255421551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353879 + ... + 357408.

It is an arithmetic number, because the mean of its divisors is an integer number (188846964).

Almost surely, 2^1255421555 is an apocalyptic number.

1255421555 is a deficient number, since it is larger than the sum of its proper divisors (255354157).

1255421555 is an equidigital number, since it uses as much as digits as its factorization.

1255421555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711645.

The product of its digits is 50000, while the sum is 35.

The square root of 1255421555 is about 35431.9284685437. The cubic root of 1255421555 is about 1078.7724836618.

The spelling of 1255421555 in words is "one billion, two hundred fifty-five million, four hundred twenty-one thousand, five hundred fifty-five".