1251423332113 has 4 divisors (see below), whose sum is σ = 1254575532340. Its totient is φ = 1248271131888.

The previous prime is 1251423332087. The next prime is 1251423332153. The reversal of 1251423332113 is 3112333241521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 317625797889 + 933797534224 = 563583^2 + 966332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251423332113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251423332153) 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, 1576099518 + ... + 1576100311.

It is an arithmetic number, because the mean of its divisors is an integer number (313643883085).

Almost surely, 2^{1251423332113} is an apocalyptic number.

It is an amenable number.

1251423332113 is a deficient number, since it is larger than the sum of its proper divisors (3152200227).

1251423332113 is an equidigital number, since it uses as much as digits as its factorization.

1251423332113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3152200226.

The product of its digits is 12960, while the sum is 31.

Adding to 1251423332113 its reverse (3112333241521), we get a palindrome (4363756573634).

The spelling of 1251423332113 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-three million, three hundred thirty-two thousand, one hundred thirteen".