51811633 has 4 divisors (see below), whose sum is σ = 53483008. Its totient is φ = 50140260.

The previous prime is 51811607. The next prime is 51811637. The reversal of 51811633 is 33611815.

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.

It is a cyclic number.

It is not a de Polignac number, because 51811633 - 2²¹ = 49714481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51811637) 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, 835641 + ... + 835702.

It is an arithmetic number, because the mean of its divisors is an integer number (13370752).

Almost surely, 2^51811633 is an apocalyptic number.

It is an amenable number.

51811633 is a deficient number, since it is larger than the sum of its proper divisors (1671375).

51811633 is a wasteful number, since it uses less digits than its factorization.

51811633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671374.

The product of its digits is 2160, while the sum is 28.

The square root of 51811633 is about 7198.0297998827. The cubic root of 51811633 is about 372.7998768358.

The spelling of 51811633 in words is "fifty-one million, eight hundred eleven thousand, six hundred thirty-three".