51651533 has 4 divisors (see below), whose sum is σ = 51857568. Its totient is φ = 51445500.

The previous prime is 51651517. The next prime is 51651539. The reversal of 51651533 is 33515615.

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 51651533 - 2⁴ = 51651517 is a prime.

It is a super-2 number, since 2×51651533² = 5335761722500178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51651496 and 51651505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51651539) 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, 102641 + ... + 103142.

It is an arithmetic number, because the mean of its divisors is an integer number (12964392).

Almost surely, 2^51651533 is an apocalyptic number.

It is an amenable number.

51651533 is a deficient number, since it is larger than the sum of its proper divisors (206035).

51651533 is a wasteful number, since it uses less digits than its factorization.

51651533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206034.

The product of its digits is 6750, while the sum is 29.

The square root of 51651533 is about 7186.9000967037. The cubic root of 51651533 is about 372.4154918423.

The spelling of 51651533 in words is "fifty-one million, six hundred fifty-one thousand, five hundred thirty-three".