1252005730091 has 4 divisors (see below), whose sum is σ = 1256005748712. Its totient is φ = 1248005711472.

The previous prime is 1252005730081. The next prime is 1252005730103. The reversal of 1252005730091 is 1900375002521.

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-1252005730091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252005730051) 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, 2000008841 + ... + 2000009466.

It is an arithmetic number, because the mean of its divisors is an integer number (314001437178).

Almost surely, 2^{1252005730091} is an apocalyptic number.

1252005730091 is a deficient number, since it is larger than the sum of its proper divisors (4000018621).

1252005730091 is an equidigital number, since it uses as much as digits as its factorization.

1252005730091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000018620.

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 1252005730091 in words is "one trillion, two hundred fifty-two billion, five million, seven hundred thirty thousand, ninety-one".