51427309 has 4 divisors (see below), whose sum is σ = 51446080. Its totient is φ = 51408540.

The previous prime is 51427307. The next prime is 51427339. The reversal of 51427309 is 90372415.

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 51427309 - 2¹ = 51427307 is a prime.

It is a super-2 number, since 2×51427309² = 5289536221962962, 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 (51427301) 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, 4389 + ... + 11050.

It is an arithmetic number, because the mean of its divisors is an integer number (12861520).

Almost surely, 2^51427309 is an apocalyptic number.

It is an amenable number.

51427309 is a deficient number, since it is larger than the sum of its proper divisors (18771).

51427309 is a wasteful number, since it uses less digits than its factorization.

51427309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18770.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 51427309 is about 7171.2836368394. The cubic root of 51427309 is about 371.8758136554.

The spelling of 51427309 in words is "fifty-one million, four hundred twenty-seven thousand, three hundred nine".