11115109951 has 4 divisors (see below), whose sum is σ = 12125574504. Its totient is φ = 10104645400.

The previous prime is 11115109939. The next prime is 11115109961. The reversal of 11115109951 is 15990151111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15990151111 = 11 ⋅1453650101.

It is a cyclic number.

It is not a de Polignac number, because 11115109951 - 2⁷ = 11115109823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11115109961) 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, 505232260 + ... + 505232281.

It is an arithmetic number, because the mean of its divisors is an integer number (3031393626).

Almost surely, 2^11115109951 is an apocalyptic number.

11115109951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11115109951 is a deficient number, since it is larger than the sum of its proper divisors (1010464553).

11115109951 is a wasteful number, since it uses less digits than its factorization.

11115109951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010464552.

The product of its (nonzero) digits is 2025, while the sum is 34.

The spelling of 11115109951 in words is "eleven billion, one hundred fifteen million, one hundred nine thousand, nine hundred fifty-one".