51368669 has 4 divisors (see below), whose sum is σ = 56038560. Its totient is φ = 46698780.

The previous prime is 51368663. The next prime is 51368671. The reversal of 51368669 is 96686315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51368669 - 2⁸ = 51368413 is a prime.

It is a super-2 number, since 2×51368669² = 5277480309663122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51368663) 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, 2334929 + ... + 2334950.

It is an arithmetic number, because the mean of its divisors is an integer number (14009640).

Almost surely, 2^51368669 is an apocalyptic number.

It is an amenable number.

51368669 is a deficient number, since it is larger than the sum of its proper divisors (4669891).

51368669 is a wasteful number, since it uses less digits than its factorization.

51368669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669890.

The product of its digits is 233280, while the sum is 44.

The square root of 51368669 is about 7167.1939418436. The cubic root of 51368669 is about 371.7344160738.

The spelling of 51368669 in words is "fifty-one million, three hundred sixty-eight thousand, six hundred sixty-nine".