51998451 has 8 divisors (see below), whose sum is σ = 69475584. Its totient is φ = 34593480.

The previous prime is 51998449. The next prime is 51998473. The reversal of 51998451 is 15489915.

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

It is not a de Polignac number, because 51998451 - 2¹ = 51998449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51998251) 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, 16335 + ... + 19256.

It is an arithmetic number, because the mean of its divisors is an integer number (8684448).

Almost surely, 2^51998451 is an apocalyptic number.

51998451 is a deficient number, since it is larger than the sum of its proper divisors (17477133).

51998451 is a wasteful number, since it uses less digits than its factorization.

51998451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36081.

The product of its digits is 64800, while the sum is 42.

The square root of 51998451 is about 7210.9951463026. The cubic root of 51998451 is about 373.2474094528.

The spelling of 51998451 in words is "fifty-one million, nine hundred ninety-eight thousand, four hundred fifty-one".