51497777 has 12 divisors (see below), whose sum is σ = 55477356. Its totient is φ = 47784960.

The previous prime is 51497729. The next prime is 51497783. The reversal of 51497777 is 77779415.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 461041 + 51036736 = 679^2 + 7144^2 .

It is not a de Polignac number, because 51497777 - 2⁸ = 51497521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51493777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19877 + ... + 22317.

It is an arithmetic number, because the mean of its divisors is an integer number (4623113).

Almost surely, 2^51497777 is an apocalyptic number.

It is an amenable number.

51497777 is a deficient number, since it is larger than the sum of its proper divisors (3979579).

51497777 is a wasteful number, since it uses less digits than its factorization.

51497777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548 (or 2531 counting only the distinct ones).

The product of its digits is 432180, while the sum is 47.

The square root of 51497777 is about 7176.1951617832. The cubic root of 51497777 is about 372.0455897608.

The spelling of 51497777 in words is "fifty-one million, four hundred ninety-seven thousand, seven hundred seventy-seven".