51611133 has 16 divisors (see below), whose sum is σ = 83272320. Its totient is φ = 27757056.

The previous prime is 51611093. The next prime is 51611141. The reversal of 51611133 is 33111615.

It is not a de Polignac number, because 51611133 - 2¹⁴ = 51594749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51611033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71928 + ... + 72641.

It is an arithmetic number, because the mean of its divisors is an integer number (5204520).

Almost surely, 2^51611133 is an apocalyptic number.

It is an amenable number.

51611133 is a deficient number, since it is larger than the sum of its proper divisors (31661187).

51611133 is a wasteful number, since it uses less digits than its factorization.

51611133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144596.

The product of its digits is 270, while the sum is 21.

The square root of 51611133 is about 7184.0888775126. The cubic root of 51611133 is about 372.3183697796.

Adding to 51611133 its reverse (33111615), we get a palindrome (84722748).

The spelling of 51611133 in words is "fifty-one million, six hundred eleven thousand, one hundred thirty-three".