11256997801 has 27 divisors (see below), whose sum is σ = 13709775261. Its totient is φ = 9215334744.

The previous prime is 11256997789. The next prime is 11256997813. The reversal of 11256997801 is 10879965211.

The square root of 11256997801 is 106099.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (11256997789) and next prime (11256997813).

It is not a de Polignac number, because 11256997801 - 2⁹ = 11256997289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (11256997841) 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 26 ways as a sum of consecutive naturals, for example, 17081610 + ... + 17082268.

Almost surely, 2^11256997801 is an apocalyptic number.

11256997801 is the 106099-th square number.

11256997801 is the 53050-th centered octagonal number.

It is an amenable number.

11256997801 is a deficient number, since it is larger than the sum of its proper divisors (2452777460).

11256997801 is an frugal number, since it uses more digits than its factorization.

11256997801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 49.

Multiplying 11256997801 by its sum of digits (49), we get a square (551592892249 = 742693²).

11256997801 divided by its sum of digits (49) gives a square (229734649 = 15157²).

The spelling of 11256997801 in words is "eleven billion, two hundred fifty-six million, nine hundred ninety-seven thousand, eight hundred one".