1251250001 has 4 divisors (see below), whose sum is σ = 1253441904. Its totient is φ = 1249058100.

The previous prime is 1251249973. The next prime is 1251250043. The reversal of 1251250001 is 1000521521.

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 a de Polignac number, because none of the positive numbers 2^k-1251250001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251250081) 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, 1095095 + ... + 1096236.

It is an arithmetic number, because the mean of its divisors is an integer number (313360476).

Almost surely, 2^1251250001 is an apocalyptic number.

It is an amenable number.

1251250001 is a deficient number, since it is larger than the sum of its proper divisors (2191903).

1251250001 is an equidigital number, since it uses as much as digits as its factorization.

1251250001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191902.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1251250001 is about 35373.0123257831. The cubic root of 1251250001 is about 1077.5762981270.

Adding to 1251250001 its reverse (1000521521), we get a palindrome (2251771522).

The spelling of 1251250001 in words is "one billion, two hundred fifty-one million, two hundred fifty thousand, one".