1255040251 has 4 divisors (see below), whose sum is σ = 1256256232. Its totient is φ = 1253824272.

The previous prime is 1255040243. The next prime is 1255040321. The reversal of 1255040251 is 1520405521.

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 1255040251 - 2³ = 1255040243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255040651) 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, 606441 + ... + 608506.

It is an arithmetic number, because the mean of its divisors is an integer number (314064058).

Almost surely, 2^1255040251 is an apocalyptic number.

1255040251 is a deficient number, since it is larger than the sum of its proper divisors (1215981).

1255040251 is a wasteful number, since it uses less digits than its factorization.

1255040251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215980.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1255040251 is about 35426.5472633165. The cubic root of 1255040251 is about 1078.6632555667.

Adding to 1255040251 its reverse (1520405521), we get a palindrome (2775445772).

The spelling of 1255040251 in words is "one billion, two hundred fifty-five million, forty thousand, two hundred fifty-one".