51420998 has 4 divisors (see below), whose sum is σ = 77131500. Its totient is φ = 25710498.

The previous prime is 51420997. The next prime is 51421001. The reversal of 51420998 is 89902415.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51420997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12855248 + ... + 12855251.

It is an arithmetic number, because the mean of its divisors is an integer number (19282875).

Almost surely, 2^51420998 is an apocalyptic number.

51420998 is a deficient number, since it is larger than the sum of its proper divisors (25710502).

51420998 is a wasteful number, since it uses less digits than its factorization.

51420998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25710501.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 51420998 is about 7170.8436044862. The cubic root of 51420998 is about 371.8606012173.

It can be divided in two parts, 514 and 20998, that added together give a palindrome (21512).

The spelling of 51420998 in words is "fifty-one million, four hundred twenty thousand, nine hundred ninety-eight".