51605090 has 8 divisors (see below), whose sum is σ = 92889180. Its totient is φ = 20642032.

The previous prime is 51605063. The next prime is 51605131. The reversal of 51605090 is 9050615.

51605090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 48539089 + 3066001 = 6967^2 + 1751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2580245 + ... + 2580264.

Almost surely, 2^51605090 is an apocalyptic number.

51605090 is a deficient number, since it is larger than the sum of its proper divisors (41284090).

51605090 is a wasteful number, since it uses less digits than its factorization.

51605090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5160516.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 51605090 is about 7183.6682829875. The cubic root of 51605090 is about 372.3038379813.

The spelling of 51605090 in words is "fifty-one million, six hundred five thousand, ninety".