51201998 has 16 divisors (see below), whose sum is σ = 81162000. Its totient is φ = 24158592.

The previous prime is 51201991. The next prime is 51202007. The reversal of 51201998 is 89910215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51201991) 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, 7718 + ... + 12726.

It is an arithmetic number, because the mean of its divisors is an integer number (5072625).

Almost surely, 2^51201998 is an apocalyptic number.

51201998 is a deficient number, since it is larger than the sum of its proper divisors (29960002).

51201998 is a wasteful number, since it uses less digits than its factorization.

51201998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5299.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 51201998 is about 7155.5571411316. The cubic root of 51201998 is about 371.3319367796.

The spelling of 51201998 in words is "fifty-one million, two hundred one thousand, nine hundred ninety-eight".