51911117 has 4 divisors (see below), whose sum is σ = 51925536. Its totient is φ = 51896700.

The previous prime is 51911113. The next prime is 51911129. The reversal of 51911117 is 71111915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51911117 - 2² = 51911113 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 (51911113) 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, 3242 + ... + 10692.

It is an arithmetic number, because the mean of its divisors is an integer number (12981384).

Almost surely, 2^51911117 is an apocalyptic number.

It is an amenable number.

51911117 is a deficient number, since it is larger than the sum of its proper divisors (14419).

51911117 is an equidigital number, since it uses as much as digits as its factorization.

51911117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14418.

The product of its digits is 315, while the sum is 26.

The square root of 51911117 is about 7204.9369879271. The cubic root of 51911117 is about 373.0383297897.

The spelling of 51911117 in words is "fifty-one million, nine hundred eleven thousand, one hundred seventeen".