51633530 has 16 divisors (see below), whose sum is σ = 100089864. Its totient is φ = 19064640.

The previous prime is 51633529. The next prime is 51633559. The reversal of 51633530 is 3533615.

It can be written as a sum of positive squares in 4 ways, for example, as 23107249 + 28526281 = 4807^2 + 5341^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 51633530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198461 + ... + 198720.

Almost surely, 2^51633530 is an apocalyptic number.

51633530 is a deficient number, since it is larger than the sum of its proper divisors (48456334).

51633530 is a wasteful number, since it uses less digits than its factorization.

51633530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397201.

The product of its (nonzero) digits is 4050, while the sum is 26.

The square root of 51633530 is about 7185.6475003997. The cubic root of 51633530 is about 372.3722186820.

The spelling of 51633530 in words is "fifty-one million, six hundred thirty-three thousand, five hundred thirty".