51001998 has 16 divisors (see below), whose sum is σ = 103441536. Its totient is φ = 16761080.

The previous prime is 51001997. The next prime is 51002011. The reversal of 51001998 is 89910015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51001997) 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, 59436 + ... + 60287.

It is an arithmetic number, because the mean of its divisors is an integer number (6465096).

Almost surely, 2^51001998 is an apocalyptic number.

51001998 is an abundant number, since it is smaller than the sum of its proper divisors (52439538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51001998 is a wasteful number, since it uses less digits than its factorization.

51001998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119799.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 51001998 is about 7141.5683151532. The cubic root of 51001998 is about 370.8478196364.

The spelling of 51001998 in words is "fifty-one million, one thousand, nine hundred ninety-eight".