51487339 has 4 divisors (see below), whose sum is σ = 54516024. Its totient is φ = 48458656.

The previous prime is 51487291. The next prime is 51487343. The reversal of 51487339 is 93378415.

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

It is a cyclic number.

It is not a de Polignac number, because 51487339 - 2²⁵ = 17932907 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51487369) 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, 1514317 + ... + 1514350.

It is an arithmetic number, because the mean of its divisors is an integer number (13629006).

Almost surely, 2^51487339 is an apocalyptic number.

51487339 is a deficient number, since it is larger than the sum of its proper divisors (3028685).

51487339 is a wasteful number, since it uses less digits than its factorization.

51487339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028684.

The product of its digits is 90720, while the sum is 40.

The square root of 51487339 is about 7175.4678593106. The cubic root of 51487339 is about 372.0204516254.

The spelling of 51487339 in words is "fifty-one million, four hundred eighty-seven thousand, three hundred thirty-nine".