51988249 has 4 divisors (see below), whose sum is σ = 52448436. Its totient is φ = 51528064.

The previous prime is 51988231. The next prime is 51988253. The reversal of 51988249 is 94288915.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15264649 + 36723600 = 3907^2 + 6060^2 .

It is a cyclic number.

It is not a de Polignac number, because 51988249 - 2⁷ = 51988121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51988199 and 51988208.

It is not an unprimeable number, because it can be changed into a prime (51988229) 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, 229924 + ... + 230149.

It is an arithmetic number, because the mean of its divisors is an integer number (13112109).

Almost surely, 2^51988249 is an apocalyptic number.

It is an amenable number.

51988249 is a deficient number, since it is larger than the sum of its proper divisors (460187).

51988249 is a wasteful number, since it uses less digits than its factorization.

51988249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460186.

The product of its digits is 207360, while the sum is 46.

The square root of 51988249 is about 7210.2877196406. The cubic root of 51988249 is about 373.2229977055. Note that the first 3 decimals are identical.

The spelling of 51988249 in words is "fifty-one million, nine hundred eighty-eight thousand, two hundred forty-nine".