51901823 has 4 divisors (see below), whose sum is σ = 54158448. Its totient is φ = 49645200.

The previous prime is 51901819. The next prime is 51901841. The reversal of 51901823 is 32810915.

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 51901823 - 2² = 51901819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51901813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1128278 + ... + 1128323.

It is an arithmetic number, because the mean of its divisors is an integer number (13539612).

Almost surely, 2^51901823 is an apocalyptic number.

51901823 is a deficient number, since it is larger than the sum of its proper divisors (2256625).

51901823 is a wasteful number, since it uses less digits than its factorization.

51901823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256624.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 51901823 is about 7204.2919846436. The cubic root of 51901823 is about 373.0160659320.

The spelling of 51901823 in words is "fifty-one million, nine hundred one thousand, eight hundred twenty-three".