51913111 has 4 divisors (see below), whose sum is σ = 54645400. Its totient is φ = 49180824.

The previous prime is 51913079. The next prime is 51913117. The reversal of 51913111 is 11131915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11131915 = 5 ⋅2226383.

It is a cyclic number.

It is not a de Polignac number, because 51913111 - 2⁵ = 51913079 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 (51913117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1366116 + ... + 1366153.

It is an arithmetic number, because the mean of its divisors is an integer number (13661350).

Almost surely, 2^51913111 is an apocalyptic number.

51913111 is a deficient number, since it is larger than the sum of its proper divisors (2732289).

51913111 is a wasteful number, since it uses less digits than its factorization.

51913111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732288.

The product of its digits is 135, while the sum is 22.

The square root of 51913111 is about 7205.0753639362. The cubic root of 51913111 is about 373.0431060878.

The spelling of 51913111 in words is "fifty-one million, nine hundred thirteen thousand, one hundred eleven".