51501998 has 16 divisors (see below), whose sum is σ = 78469776. Its totient is φ = 25347840.

The previous prime is 51501997. The next prime is 51502007. The reversal of 51501998 is 89910515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51501997) 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, 76190 + ... + 76862.

It is an arithmetic number, because the mean of its divisors is an integer number (4904361).

Almost surely, 2^51501998 is an apocalyptic number.

51501998 is a deficient number, since it is larger than the sum of its proper divisors (26967778).

51501998 is a wasteful number, since it uses less digits than its factorization.

51501998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 51501998 is about 7176.4892531098. The cubic root of 51501998 is about 372.0557543519.

The spelling of 51501998 in words is "fifty-one million, five hundred one thousand, nine hundred ninety-eight".