51281199 has 6 divisors (see below), whose sum is σ = 74072856. Its totient is φ = 34187460.

The previous prime is 51281189. The next prime is 51281213. The reversal of 51281199 is 99118215.

It is not a de Polignac number, because 51281199 - 2⁷ = 51281071 is a prime.

It is a super-2 number, since 2×51281199² = 5259522741755202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51281189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2848947 + ... + 2848964.

It is an arithmetic number, because the mean of its divisors is an integer number (12345476).

Almost surely, 2^51281199 is an apocalyptic number.

51281199 is a deficient number, since it is larger than the sum of its proper divisors (22791657).

51281199 is a wasteful number, since it uses less digits than its factorization.

51281199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5697917 (or 5697914 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 51281199 is about 7161.0892327913. The cubic root of 51281199 is about 371.5233011197.

The spelling of 51281199 in words is "fifty-one million, two hundred eighty-one thousand, one hundred ninety-nine".