51222645 has 32 divisors (see below), whose sum is σ = 92793600. Its totient is φ = 26799552.

The previous prime is 51222641. The next prime is 51222659. The reversal of 51222645 is 54622215.

51222645 is a `hidden beast` number, since 5 + 12 + 2 + 2 + 645 = 666.

51222645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51222645 - 2² = 51222641 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222641) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 3576 + ... + 10734.

It is an arithmetic number, because the mean of its divisors is an integer number (2899800).

Almost surely, 2^51222645 is an apocalyptic number.

It is an amenable number.

51222645 is a deficient number, since it is larger than the sum of its proper divisors (41570955).

51222645 is a wasteful number, since it uses less digits than its factorization.

51222645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7226 (or 7220 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 51222645 is about 7156.9997205533. Note that the first 3 decimals coincide. The cubic root of 51222645 is about 371.3818427760.

The spelling of 51222645 in words is "fifty-one million, two hundred twenty-two thousand, six hundred forty-five".