51287533 has 4 divisors (see below), whose sum is σ = 55950048. Its totient is φ = 46625020.

The previous prime is 51287503. The next prime is 51287543. The reversal of 51287533 is 33578215.

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 51287533 - 2⁵ = 51287501 is a prime.

It is a super-2 number, since 2×51287533² = 5260822082452178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51287503) 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, 2331241 + ... + 2331262.

It is an arithmetic number, because the mean of its divisors is an integer number (13987512).

Almost surely, 2^51287533 is an apocalyptic number.

It is an amenable number.

51287533 is a deficient number, since it is larger than the sum of its proper divisors (4662515).

51287533 is a wasteful number, since it uses less digits than its factorization.

51287533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662514.

The product of its digits is 25200, while the sum is 34.

The square root of 51287533 is about 7161.5314702932. The cubic root of 51287533 is about 371.5385967300.

The spelling of 51287533 in words is "fifty-one million, two hundred eighty-seven thousand, five hundred thirty-three".