51982249 has 4 divisors (see below), whose sum is σ = 56707920. Its totient is φ = 47256580.

The previous prime is 51982223. The next prime is 51982253. The reversal of 51982249 is 94228915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51982249 - 2⁷ = 51982121 is a prime.

It is a super-2 number, since 2×51982249² = 5404308422196002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51982279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2362819 + ... + 2362840.

It is an arithmetic number, because the mean of its divisors is an integer number (14176980).

Almost surely, 2^51982249 is an apocalyptic number.

It is an amenable number.

51982249 is a deficient number, since it is larger than the sum of its proper divisors (4725671).

51982249 is a wasteful number, since it uses less digits than its factorization.

51982249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4725670.

The product of its digits is 51840, while the sum is 40.

The square root of 51982249 is about 7209.8716354731. The cubic root of 51982249 is about 373.2086391778.

It can be divided in two parts, 5198 and 2249, that added together give a palindrome (7447).

The spelling of 51982249 in words is "fifty-one million, nine hundred eighty-two thousand, two hundred forty-nine".