1255503001 has 4 divisors (see below), whose sum is σ = 1310090112. Its totient is φ = 1200915892.

The previous prime is 1255502987. The next prime is 1255503013. The reversal of 1255503001 is 1003055521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1255503001 - 2⁹ = 1255502489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255503031) 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, 27293521 + ... + 27293566.

It is an arithmetic number, because the mean of its divisors is an integer number (327522528).

Almost surely, 2^1255503001 is an apocalyptic number.

It is an amenable number.

1255503001 is a deficient number, since it is larger than the sum of its proper divisors (54587111).

1255503001 is an equidigital number, since it uses as much as digits as its factorization.

1255503001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54587110.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 1255503001 is about 35433.0777805146. The cubic root of 1255503001 is about 1078.7958117631.

Adding to 1255503001 its reverse (1003055521), we get a palindrome (2258558522).

The spelling of 1255503001 in words is "one billion, two hundred fifty-five million, five hundred three thousand, one".