51843961 has 24 divisors (see below), whose sum is σ = 58817664. Its totient is φ = 45639360.

The previous prime is 51843959. The next prime is 51843971. The reversal of 51843961 is 16934815.

It is the 2940-th star number.

It is not a de Polignac number, because 51843961 - 2¹ = 51843959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51843961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51843901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 484470 + ... + 484576.

It is an arithmetic number, because the mean of its divisors is an integer number (2450736).

Almost surely, 2^51843961 is an apocalyptic number.

It is an amenable number.

51843961 is a deficient number, since it is larger than the sum of its proper divisors (6973703).

51843961 is a wasteful number, since it uses less digits than its factorization.

51843961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 228 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 51843961 is about 7200.2750641903. The cubic root of 51843961 is about 372.8773971917.

The spelling of 51843961 in words is "fifty-one million, eight hundred forty-three thousand, nine hundred sixty-one".