51427387 has 4 divisors (see below), whose sum is σ = 56102616. Its totient is φ = 46752160.

The previous prime is 51427367. The next prime is 51427393. The reversal of 51427387 is 78372415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51427387 is a prime.

It is a super-2 number, since 2×51427387² = 5289552267295538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51427307) 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, 2337598 + ... + 2337619.

It is an arithmetic number, because the mean of its divisors is an integer number (14025654).

Almost surely, 2^51427387 is an apocalyptic number.

51427387 is a deficient number, since it is larger than the sum of its proper divisors (4675229).

51427387 is a wasteful number, since it uses less digits than its factorization.

51427387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4675228.

The product of its digits is 47040, while the sum is 37.

The square root of 51427387 is about 7171.2890751942. The cubic root of 51427387 is about 371.8760016639.

The spelling of 51427387 in words is "fifty-one million, four hundred twenty-seven thousand, three hundred eighty-seven".