51516499 has 8 divisors (see below), whose sum is σ = 54198000. Its totient is φ = 48895392.

The previous prime is 51516497. The next prime is 51516503. The reversal of 51516499 is 99461515.

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

It is not a de Polignac number, because 51516499 - 2¹ = 51516497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51516497) 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, 13344 + ... + 16765.

It is an arithmetic number, because the mean of its divisors is an integer number (6774750).

Almost surely, 2^51516499 is an apocalyptic number.

51516499 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

51516499 is a deficient number, since it is larger than the sum of its proper divisors (2681501).

51516499 is a wasteful number, since it uses less digits than its factorization.

51516499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30197.

The product of its digits is 48600, while the sum is 40.

The square root of 51516499 is about 7177.4994949495. The cubic root of 51516499 is about 372.0906699825.

The spelling of 51516499 in words is "fifty-one million, five hundred sixteen thousand, four hundred ninety-nine".