51499387 has 4 divisors (see below), whose sum is σ = 51784096. Its totient is φ = 51214680.

The previous prime is 51499381. The next prime is 51499391. The reversal of 51499387 is 78399415.

It is a happy number.

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 51499387 - 2³ = 51499379 is a prime.

It is a super-2 number, since 2×51499387² = 5304373722751538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51499381) 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, 142083 + ... + 142444.

It is an arithmetic number, because the mean of its divisors is an integer number (12946024).

Almost surely, 2^51499387 is an apocalyptic number.

51499387 is a deficient number, since it is larger than the sum of its proper divisors (284709).

51499387 is a wasteful number, since it uses less digits than its factorization.

51499387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284708.

The product of its digits is 272160, while the sum is 46.

The square root of 51499387 is about 7176.3073373428. The cubic root of 51499387 is about 372.0494668677.

The spelling of 51499387 in words is "fifty-one million, four hundred ninety-nine thousand, three hundred eighty-seven".