1255111001 has 8 divisors (see below), whose sum is σ = 1267169280. Its totient is φ = 1243069632.

The previous prime is 1255110959. The next prime is 1255111031. The reversal of 1255111001 is 1001115521.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255111001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255111031) 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, 184580 + ... + 191258.

It is an arithmetic number, because the mean of its divisors is an integer number (158396160).

Almost surely, 2^1255111001 is an apocalyptic number.

It is an amenable number.

1255111001 is a deficient number, since it is larger than the sum of its proper divisors (12058279).

1255111001 is a wasteful number, since it uses less digits than its factorization.

1255111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8455.

The product of its (nonzero) digits is 50, while the sum is 17.

The square root of 1255111001 is about 35427.5457941981. The cubic root of 1255111001 is about 1078.6835242370.

Adding to 1255111001 its reverse (1001115521), we get a palindrome (2256226522).

The spelling of 1255111001 in words is "one billion, two hundred fifty-five million, one hundred eleven thousand, one".