1251112001 has 8 divisors (see below), whose sum is σ = 1259766144. Its totient is φ = 1242477360.

The previous prime is 1251111989. The next prime is 1251112003. The reversal of 1251112001 is 1002111521.

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

It is a cyclic number.

It is not a de Polignac number, because 1251112001 - 2¹⁴ = 1251095617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251112003) 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, 138056 + ... + 146838.

It is an arithmetic number, because the mean of its divisors is an integer number (157470768).

Almost surely, 2^1251112001 is an apocalyptic number.

It is an amenable number.

1251112001 is a deficient number, since it is larger than the sum of its proper divisors (8654143).

1251112001 is an equidigital number, since it uses as much as digits as its factorization.

1251112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9751.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 1251112001 is about 35371.0616323570. The cubic root of 1251112001 is about 1077.5366814780.

Adding to 1251112001 its reverse (1002111521), we get a palindrome (2253223522).

The spelling of 1251112001 in words is "one billion, two hundred fifty-one million, one hundred twelve thousand, one".