122138645 has 4 divisors (see below), whose sum is σ = 146566380. Its totient is φ = 97710912.

The previous prime is 122138641. The next prime is 122138647. The reversal of 122138645 is 546831221.

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 73376356 + 48762289 = 8566^2 + 6983^2 .

It is a cyclic number.

It is not a de Polignac number, because 122138645 - 2² = 122138641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122138641) 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, 12213860 + ... + 12213869.

It is an arithmetic number, because the mean of its divisors is an integer number (36641595).

Almost surely, 2^122138645 is an apocalyptic number.

It is an amenable number.

122138645 is a deficient number, since it is larger than the sum of its proper divisors (24427735).

122138645 is an equidigital number, since it uses as much as digits as its factorization.

122138645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24427734.

The product of its digits is 11520, while the sum is 32.

The square root of 122138645 is about 11051.6353993425. The cubic root of 122138645 is about 496.1553734643.

Adding to 122138645 its reverse (546831221), we get a palindrome (668969866).

It can be divided in two parts, 1221386 and 45, that multiplied together give a triangular number (54962370 = T₁₀₄₈₄).

The spelling of 122138645 in words is "one hundred twenty-two million, one hundred thirty-eight thousand, six hundred forty-five".