51777994 has 4 divisors (see below), whose sum is σ = 77666994. Its totient is φ = 25888996.

The previous prime is 51777961. The next prime is 51778003. The reversal of 51777994 is 49977715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 47430769 + 4347225 = 6887^2 + 2085^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 12944497 + ... + 12944500.

Almost surely, 2^51777994 is an apocalyptic number.

51777994 is a deficient number, since it is larger than the sum of its proper divisors (25889000).

51777994 is a wasteful number, since it uses less digits than its factorization.

51777994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25888999.

The product of its digits is 555660, while the sum is 49.

The square root of 51777994 is about 7195.6927394102. The cubic root of 51777994 is about 372.7191785490.

The spelling of 51777994 in words is "fifty-one million, seven hundred seventy-seven thousand, nine hundred ninety-four".