51911199 has 20 divisors (see below), whose sum is σ = 78357664. Its totient is φ = 34245504.

The previous prime is 51911129. The next prime is 51911213. The reversal of 51911199 is 99111915.

It is not a de Polignac number, because 51911199 - 2¹⁹ = 51386911 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 (51911129) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4554 + ... + 11160.

Almost surely, 2^51911199 is an apocalyptic number.

51911199 is a deficient number, since it is larger than the sum of its proper divisors (26446465).

51911199 is an equidigital number, since it uses as much as digits as its factorization.

51911199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6716 (or 6707 counting only the distinct ones).

The product of its digits is 3645, while the sum is 36.

The square root of 51911199 is about 7204.9426784673. The cubic root of 51911199 is about 373.0385262096.

The spelling of 51911199 in words is "fifty-one million, nine hundred eleven thousand, one hundred ninety-nine".