51161777 has 4 divisors (see below), whose sum is σ = 51689316. Its totient is φ = 50634240.

The previous prime is 51161753. The next prime is 51161779. The reversal of 51161777 is 77716115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13719616 + 37442161 = 3704^2 + 6119^2 .

It is a cyclic number.

It is not a de Polignac number, because 51161777 - 2²⁴ = 34384561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51161779) 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, 263624 + ... + 263817.

It is an arithmetic number, because the mean of its divisors is an integer number (12922329).

Almost surely, 2^51161777 is an apocalyptic number.

It is an amenable number.

51161777 is a deficient number, since it is larger than the sum of its proper divisors (527539).

51161777 is an equidigital number, since it uses as much as digits as its factorization.

51161777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527538.

The product of its digits is 10290, while the sum is 35.

The square root of 51161777 is about 7152.7461160033. The cubic root of 51161777 is about 371.2346798048.

The spelling of 51161777 in words is "fifty-one million, one hundred sixty-one thousand, seven hundred seventy-seven".