51916777 has 4 divisors (see below), whose sum is σ = 56636496. Its totient is φ = 47197060.

The previous prime is 51916763. The next prime is 51916801. The reversal of 51916777 is 77761915.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 51916777 - 2⁷ = 51916649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51916747) 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, 2359843 + ... + 2359864.

It is an arithmetic number, because the mean of its divisors is an integer number (14159124).

Almost surely, 2^51916777 is an apocalyptic number.

It is an amenable number.

51916777 is a deficient number, since it is larger than the sum of its proper divisors (4719719).

51916777 is a wasteful number, since it uses less digits than its factorization.

51916777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4719718.

The product of its digits is 92610, while the sum is 43.

The square root of 51916777 is about 7205.3297634459. The cubic root of 51916777 is about 373.0518870669.

The spelling of 51916777 in words is "fifty-one million, nine hundred sixteen thousand, seven hundred seventy-seven".