51222207 has 32 divisors (see below), whose sum is σ = 76204800. Its totient is φ = 30453248.

The previous prime is 51222187. The next prime is 51222211. The reversal of 51222207 is 70222215.

It is a happy number.

It is not a de Polignac number, because 51222207 - 2¹¹ = 51220159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86968 + ... + 87554.

It is an arithmetic number, because the mean of its divisors is an integer number (2381400).

Almost surely, 2^51222207 is an apocalyptic number.

51222207 is a deficient number, since it is larger than the sum of its proper divisors (24982593).

51222207 is a wasteful number, since it uses less digits than its factorization.

51222207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 51222207 is about 7156.9691210735. The cubic root of 51222207 is about 371.3807842226.

The spelling of 51222207 in words is "fifty-one million, two hundred twenty-two thousand, two hundred seven".