51897249 has 6 divisors (see below), whose sum is σ = 74962706. Its totient is φ = 34598160.

The previous prime is 51897221. The next prime is 51897289. The reversal of 51897249 is 94279815.

51897249 is a `hidden beast` number, since 518 + 97 + 2 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 36687249 + 15210000 = 6057^2 + 3900^2 .

It is not a de Polignac number, because 51897249 - 2¹⁶ = 51831713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51897289) 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, 2883172 + ... + 2883189.

Almost surely, 2^51897249 is an apocalyptic number.

It is an amenable number.

51897249 is a deficient number, since it is larger than the sum of its proper divisors (23065457).

51897249 is a wasteful number, since it uses less digits than its factorization.

51897249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5766367 (or 5766364 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 51897249 is about 7203.9745279949. The cubic root of 51897249 is about 373.0051078994.

The spelling of 51897249 in words is "fifty-one million, eight hundred ninety-seven thousand, two hundred forty-nine".