1251144252101 has 4 divisors (see below), whose sum is σ = 1316993949600. Its totient is φ = 1185294554604.

The previous prime is 1251144252097. The next prime is 1251144252157. The reversal of 1251144252101 is 1012524411521.

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 1251144252101 - 2² = 1251144252097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251144272101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32924848721 + ... + 32924848758.

It is an arithmetic number, because the mean of its divisors is an integer number (329248487400).

Almost surely, 2^{1251144252101} is an apocalyptic number.

It is an amenable number.

1251144252101 is a deficient number, since it is larger than the sum of its proper divisors (65849697499).

1251144252101 is an equidigital number, since it uses as much as digits as its factorization.

1251144252101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65849697498.

The product of its (nonzero) digits is 3200, while the sum is 29.

Adding to 1251144252101 its reverse (1012524411521), we get a palindrome (2263668663622).

The spelling of 1251144252101 in words is "one trillion, two hundred fifty-one billion, one hundred forty-four million, two hundred fifty-two thousand, one hundred one".