122561645 has 4 divisors (see below), whose sum is σ = 147073980. Its totient is φ = 98049312.

The previous prime is 122561623. The next prime is 122561651. The reversal of 122561645 is 546165221.

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 35307364 + 87254281 = 5942^2 + 9341^2 .

It is a cyclic number.

It is not a de Polignac number, because 122561645 - 2²⁶ = 55452781 is a prime.

It is a super-3 number, since 3×122561645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12256160 + ... + 12256169.

It is an arithmetic number, because the mean of its divisors is an integer number (36768495).

Almost surely, 2^122561645 is an apocalyptic number.

It is an amenable number.

122561645 is a deficient number, since it is larger than the sum of its proper divisors (24512335).

122561645 is an equidigital number, since it uses as much as digits as its factorization.

122561645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24512334.

The product of its digits is 14400, while the sum is 32.

The square root of 122561645 is about 11070.7562975616. The cubic root of 122561645 is about 496.7274880598.

The spelling of 122561645 in words is "one hundred twenty-two million, five hundred sixty-one thousand, six hundred forty-five".