51515998 has 8 divisors (see below), whose sum is σ = 80633808. Its totient is φ = 24638064.

The previous prime is 51515983. The next prime is 51515999. The reversal of 51515998 is 89951515.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559911 + ... + 560002.

It is an arithmetic number, because the mean of its divisors is an integer number (10079226).

Almost surely, 2^51515998 is an apocalyptic number.

51515998 is a deficient number, since it is larger than the sum of its proper divisors (29117810).

51515998 is a wasteful number, since it uses less digits than its factorization.

51515998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119938.

The product of its digits is 81000, while the sum is 43.

The square root of 51515998 is about 7177.4645941307. The cubic root of 51515998 is about 372.0894637797.

The spelling of 51515998 in words is "fifty-one million, five hundred fifteen thousand, nine hundred ninety-eight".