1251001051 has 4 divisors (see below), whose sum is σ = 1252645704. Its totient is φ = 1249356400.

The previous prime is 1251001033. The next prime is 1251001057. The reversal of 1251001051 is 1501001521.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251001051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251001057) 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, 821185 + ... + 822706.

It is an arithmetic number, because the mean of its divisors is an integer number (313161426).

Almost surely, 2^1251001051 is an apocalyptic number.

1251001051 is a deficient number, since it is larger than the sum of its proper divisors (1644653).

1251001051 is an equidigital number, since it uses as much as digits as its factorization.

1251001051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644652.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 1251001051 is about 35369.4932250944. The cubic root of 1251001051 is about 1077.5048281536.

Adding to 1251001051 its reverse (1501001521), we get a palindrome (2752002572).

The spelling of 1251001051 in words is "one billion, two hundred fifty-one million, one thousand, fifty-one".