51122505 has 64 divisors (see below), whose sum is σ = 98242560. Its totient is φ = 22208256.

The previous prime is 51122501. The next prime is 51122507. The reversal of 51122505 is 50522115.

It is not a de Polignac number, because 51122505 - 2² = 51122501 is a prime.

It is a super-2 number, since 2×51122505² = 5227021034950050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (51122501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 313554 + ... + 313716.

It is an arithmetic number, because the mean of its divisors is an integer number (1535040).

Almost surely, 2^51122505 is an apocalyptic number.

It is an amenable number.

51122505 is a deficient number, since it is larger than the sum of its proper divisors (47120055).

51122505 is a wasteful number, since it uses less digits than its factorization.

51122505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51122505 is about 7150.0003496503. Note that the first 3 decimals coincide. The cubic root of 51122505 is about 371.1396683781.

The spelling of 51122505 in words is "fifty-one million, one hundred twenty-two thousand, five hundred five".