51771998 has 8 divisors (see below), whose sum is σ = 81745320. Its totient is φ = 24523560.

The previous prime is 51771983. The next prime is 51772001. The reversal of 51771998 is 89917715.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681173 + ... + 681248.

It is an arithmetic number, because the mean of its divisors is an integer number (10218165).

Almost surely, 2^51771998 is an apocalyptic number.

51771998 is a deficient number, since it is larger than the sum of its proper divisors (29973322).

51771998 is a wasteful number, since it uses less digits than its factorization.

51771998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362442.

The product of its digits is 158760, while the sum is 47.

The square root of 51771998 is about 7195.2760892130. The cubic root of 51771998 is about 372.7047907735.

The spelling of 51771998 in words is "fifty-one million, seven hundred seventy-one thousand, nine hundred ninety-eight".