1251802091401 has 4 divisors (see below), whose sum is σ = 1306228269312. Its totient is φ = 1197375913492.

The previous prime is 1251802091383. The next prime is 1251802091509. The reversal of 1251802091401 is 1041902081521.

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 1251802091401 - 2⁷ = 1251802091273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251802094401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27213088921 + ... + 27213088966.

It is an arithmetic number, because the mean of its divisors is an integer number (326557067328).

Almost surely, 2^{1251802091401} is an apocalyptic number.

It is an amenable number.

1251802091401 is a deficient number, since it is larger than the sum of its proper divisors (54426177911).

1251802091401 is an equidigital number, since it uses as much as digits as its factorization.

1251802091401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54426177910.

The product of its (nonzero) digits is 5760, while the sum is 34.

The spelling of 1251802091401 in words is "one trillion, two hundred fifty-one billion, eight hundred two million, ninety-one thousand, four hundred one".