51387973 has 8 divisors (see below), whose sum is σ = 63246848. Its totient is φ = 40658544.

The previous prime is 51387961. The next prime is 51388019. The reversal of 51387973 is 37978315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51387973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51387953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282261 + ... + 282442.

It is an arithmetic number, because the mean of its divisors is an integer number (7905856).

Almost surely, 2^51387973 is an apocalyptic number.

It is an amenable number.

51387973 is a deficient number, since it is larger than the sum of its proper divisors (11858875).

51387973 is a wasteful number, since it uses less digits than its factorization.

51387973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564723.

The product of its digits is 158760, while the sum is 43.

The square root of 51387973 is about 7168.5405069651. The cubic root of 51387973 is about 371.7809753391.

The spelling of 51387973 in words is "fifty-one million, three hundred eighty-seven thousand, nine hundred seventy-three".