51866801 has 4 divisors (see below), whose sum is σ = 59276352. Its totient is φ = 44457252.

The previous prime is 51866791. The next prime is 51866809. The reversal of 51866801 is 10866815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10866815 = 5 ⋅2173363.

It is a de Polignac number, because none of the positive numbers 2^k-51866801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51866809) 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, 3704765 + ... + 3704778.

It is an arithmetic number, because the mean of its divisors is an integer number (14819088).

Almost surely, 2^51866801 is an apocalyptic number.

It is an amenable number.

51866801 is a deficient number, since it is larger than the sum of its proper divisors (7409551).

51866801 is an equidigital number, since it uses as much as digits as its factorization.

51866801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7409550.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 51866801 is about 7201.8609400626. The cubic root of 51866801 is about 372.9321465411.

The spelling of 51866801 in words is "fifty-one million, eight hundred sixty-six thousand, eight hundred one".