51908243 has 4 divisors (see below), whose sum is σ = 52422288. Its totient is φ = 51394200.

The previous prime is 51908239. The next prime is 51908249. The reversal of 51908243 is 34280915.

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

It is a cyclic number.

It is not a de Polignac number, because 51908243 - 2² = 51908239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51908249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256871 + ... + 257072.

It is an arithmetic number, because the mean of its divisors is an integer number (13105572).

Almost surely, 2^51908243 is an apocalyptic number.

51908243 is a deficient number, since it is larger than the sum of its proper divisors (514045).

51908243 is a wasteful number, since it uses less digits than its factorization.

51908243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514044.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 51908243 is about 7204.7375385922. The cubic root of 51908243 is about 373.0314453816.

The spelling of 51908243 in words is "fifty-one million, nine hundred eight thousand, two hundred forty-three".