51761869 has 4 divisors (see below), whose sum is σ = 51785244. Its totient is φ = 51738496.

The previous prime is 51761861. The next prime is 51761873. The reversal of 51761869 is 96816715.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96816715 = 5 ⋅19363343.

It can be written as a sum of positive squares in 2 ways, for example, as 28355625 + 23406244 = 5325^2 + 4838^2 .

It is a cyclic number.

It is not a de Polignac number, because 51761869 - 2³ = 51761861 is a prime.

It is a super-2 number, since 2×51761869² = 5358582164746322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51761861) 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, 7972 + ... + 12925.

It is an arithmetic number, because the mean of its divisors is an integer number (12946311).

Almost surely, 2^51761869 is an apocalyptic number.

It is an amenable number.

51761869 is a deficient number, since it is larger than the sum of its proper divisors (23375).

51761869 is a wasteful number, since it uses less digits than its factorization.

51761869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23374.

The product of its digits is 90720, while the sum is 43.

The square root of 51761869 is about 7194.5721902001. The cubic root of 51761869 is about 372.6804830834.

The spelling of 51761869 in words is "fifty-one million, seven hundred sixty-one thousand, eight hundred sixty-nine".