51039785 has 4 divisors (see below), whose sum is σ = 61247748. Its totient is φ = 40831824.

The previous prime is 51039773. The next prime is 51039787. The reversal of 51039785 is 58793015.

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 31494544 + 19545241 = 5612^2 + 4421^2 .

It is a cyclic number.

It is not a de Polignac number, because 51039785 - 2¹⁶ = 50974249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51039787) 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, 5103974 + ... + 5103983.

It is an arithmetic number, because the mean of its divisors is an integer number (15311937).

Almost surely, 2^51039785 is an apocalyptic number.

It is an amenable number.

51039785 is a deficient number, since it is larger than the sum of its proper divisors (10207963).

51039785 is a wasteful number, since it uses less digits than its factorization.

51039785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10207962.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 51039785 is about 7144.2133926696. The cubic root of 51039785 is about 370.9393831552.

The spelling of 51039785 in words is "fifty-one million, thirty-nine thousand, seven hundred eighty-five".