51113785 has 4 divisors (see below), whose sum is σ = 61336548. Its totient is φ = 40891024.

The previous prime is 51113771. The next prime is 51113789. The reversal of 51113785 is 58731115.

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 17438976 + 33674809 = 4176^2 + 5803^2 .

It is a cyclic number.

It is not a de Polignac number, because 51113785 - 2¹¹ = 51111737 is a prime.

It is a super-2 number, since 2×51113785² = 5225238034052450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51113789) 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, 5111374 + ... + 5111383.

It is an arithmetic number, because the mean of its divisors is an integer number (15334137).

Almost surely, 2^51113785 is an apocalyptic number.

It is an amenable number.

51113785 is a deficient number, since it is larger than the sum of its proper divisors (10222763).

51113785 is a wasteful number, since it uses less digits than its factorization.

51113785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10222762.

The product of its digits is 4200, while the sum is 31.

The square root of 51113785 is about 7149.3905334651. The cubic root of 51113785 is about 371.1185653308.

The spelling of 51113785 in words is "fifty-one million, one hundred thirteen thousand, seven hundred eighty-five".