51061669 has 4 divisors (see below), whose sum is σ = 51104844. Its totient is φ = 51018496.

The previous prime is 51061667. The next prime is 51061691. The reversal of 51061669 is 96616015.

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 22439169 + 28622500 = 4737^2 + 5350^2 .

It is a cyclic number.

It is not a de Polignac number, because 51061669 - 2¹ = 51061667 is a prime.

It is a super-2 number, since 2×51061669² = 5214588082131122, 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 (51061667) 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, 19762 + ... + 22195.

It is an arithmetic number, because the mean of its divisors is an integer number (12776211).

Almost surely, 2^51061669 is an apocalyptic number.

It is an amenable number.

51061669 is a deficient number, since it is larger than the sum of its proper divisors (43175).

51061669 is a wasteful number, since it uses less digits than its factorization.

51061669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43174.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 51061669 is about 7145.7448177219. The cubic root of 51061669 is about 370.9923906771.

The spelling of 51061669 in words is "fifty-one million, sixty-one thousand, six hundred sixty-nine".