1255401187 has 4 divisors (see below), whose sum is σ = 1256005960. Its totient is φ = 1254796416.

The previous prime is 1255401179. The next prime is 1255401209. The reversal of 1255401187 is 7811045521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1255401187 - 2³ = 1255401179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255401487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299262 + ... + 303427.

It is an arithmetic number, because the mean of its divisors is an integer number (314001490).

Almost surely, 2^1255401187 is an apocalyptic number.

1255401187 is a deficient number, since it is larger than the sum of its proper divisors (604773).

1255401187 is an equidigital number, since it uses as much as digits as its factorization.

1255401187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604772.

The product of its (nonzero) digits is 11200, while the sum is 34.

The square root of 1255401187 is about 35431.6410430000. The cubic root of 1255401187 is about 1078.7666496170.

The spelling of 1255401187 in words is "one billion, two hundred fifty-five million, four hundred one thousand, one hundred eighty-seven".