1251253101403 has 4 divisors (see below), whose sum is σ = 1251257184360. Its totient is φ = 1251249018448.

The previous prime is 1251253101337. The next prime is 1251253101431. The reversal of 1251253101403 is 3041013521521.

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-1251253101403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251253101103) 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, 1540873 + ... + 2208346.

It is an arithmetic number, because the mean of its divisors is an integer number (312814296090).

Almost surely, 2^{1251253101403} is an apocalyptic number.

1251253101403 is a deficient number, since it is larger than the sum of its proper divisors (4082957).

1251253101403 is an equidigital number, since it uses as much as digits as its factorization.

1251253101403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082956.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 1251253101403 its reverse (3041013521521), we get a palindrome (4292266622924).

The spelling of 1251253101403 in words is "one trillion, two hundred fifty-one billion, two hundred fifty-three million, one hundred one thousand, four hundred three".