122981645 has 4 divisors (see below), whose sum is σ = 147577980. Its totient is φ = 98385312.

The previous prime is 122981641. The next prime is 122981647. The reversal of 122981645 is 546189221.

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 32103556 + 90878089 = 5666^2 + 9533^2 .

It is a cyclic number.

It is not a de Polignac number, because 122981645 - 2² = 122981641 is a prime.

It is a super-3 number, since 3×122981645³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 122981599 and 122981608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122981641) 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, 12298160 + ... + 12298169.

It is an arithmetic number, because the mean of its divisors is an integer number (36894495).

Almost surely, 2^122981645 is an apocalyptic number.

It is an amenable number.

122981645 is a deficient number, since it is larger than the sum of its proper divisors (24596335).

122981645 is an equidigital number, since it uses as much as digits as its factorization.

122981645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24596334.

The product of its digits is 34560, while the sum is 38.

The square root of 122981645 is about 11089.7089682282. The cubic root of 122981645 is about 497.2942441831.

The spelling of 122981645 in words is "one hundred twenty-two million, nine hundred eighty-one thousand, six hundred forty-five".