51261849 has 16 divisors (see below), whose sum is σ = 77797440. Its totient is φ = 33340320.

The previous prime is 51261839. The next prime is 51261857. The reversal of 51261849 is 94816215.

51261849 is a `hidden beast` number, since 512 + 61 + 84 + 9 = 666.

It is not a de Polignac number, because 51261849 - 2¹⁷ = 51130777 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51261839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22047 + ... + 24260.

It is an arithmetic number, because the mean of its divisors is an integer number (4862340).

Almost surely, 2^51261849 is an apocalyptic number.

It is an amenable number.

51261849 is a deficient number, since it is larger than the sum of its proper divisors (26535591).

51261849 is a wasteful number, since it uses less digits than its factorization.

51261849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46357 (or 46351 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 51261849 is about 7159.7380538676. The cubic root of 51261849 is about 371.4765661212.

The spelling of 51261849 in words is "fifty-one million, two hundred sixty-one thousand, eight hundred forty-nine".