51601266 has 64 divisors (see below), whose sum is σ = 120355200. Its totient is φ = 16365888.

The previous prime is 51601219. The next prime is 51601271. The reversal of 51601266 is 66210615.

It is a happy number.

51601266 is a `hidden beast` number, since 51 + 601 + 2 + 6 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129780 + ... + 130176.

It is an arithmetic number, because the mean of its divisors is an integer number (1880550).

Almost surely, 2^51601266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51601266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60177600).

51601266 is an abundant number, since it is smaller than the sum of its proper divisors (68753934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51601266 is a wasteful number, since it uses less digits than its factorization.

51601266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 51601266 is about 7183.4021187735. The cubic root of 51601266 is about 372.2946416982.

The spelling of 51601266 in words is "fifty-one million, six hundred one thousand, two hundred sixty-six".