122147845 has 4 divisors (see below), whose sum is σ = 146577420. Its totient is φ = 97718272.

The previous prime is 122147833. The next prime is 122147849. The reversal of 122147845 is 548741221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19368801 + 102779044 = 4401^2 + 10138^2 .

It is a cyclic number.

It is not a de Polignac number, because 122147845 - 2⁵ = 122147813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122147845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122147849) 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 3 ways as a sum of consecutive naturals, for example, 12214780 + ... + 12214789.

It is an arithmetic number, because the mean of its divisors is an integer number (36644355).

Almost surely, 2^122147845 is an apocalyptic number.

It is an amenable number.

122147845 is a deficient number, since it is larger than the sum of its proper divisors (24429575).

122147845 is an equidigital number, since it uses as much as digits as its factorization.

122147845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24429574.

The product of its digits is 17920, while the sum is 34.

The square root of 122147845 is about 11052.0516194958. The cubic root of 122147845 is about 496.1678306595.

The spelling of 122147845 in words is "one hundred twenty-two million, one hundred forty-seven thousand, eight hundred forty-five".