51359669 has 4 divisors (see below), whose sum is σ = 54380844. Its totient is φ = 48338496.

The previous prime is 51359639. The next prime is 51359683. The reversal of 51359669 is 96695315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96695315 = 5 ⋅19339063.

It can be written as a sum of positive squares in 2 ways, for example, as 42745444 + 8614225 = 6538^2 + 2935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51359669 is a prime.

It is a super-2 number, since 2×51359669² = 5275631199579122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51359629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510562 + ... + 1510595.

It is an arithmetic number, because the mean of its divisors is an integer number (13595211).

Almost surely, 2^51359669 is an apocalyptic number.

It is an amenable number.

51359669 is a deficient number, since it is larger than the sum of its proper divisors (3021175).

51359669 is a wasteful number, since it uses less digits than its factorization.

51359669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021174.

The product of its digits is 218700, while the sum is 44.

The square root of 51359669 is about 7166.5660535573. The cubic root of 51359669 is about 371.7127050113.

The spelling of 51359669 in words is "fifty-one million, three hundred fifty-nine thousand, six hundred sixty-nine".