121640741 has 2 divisors, whose sum is σ = 121640742. Its totient is φ = 121640740.

The previous prime is 121640677. The next prime is 121640773. The reversal of 121640741 is 147046121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114597025 + 7043716 = 10705^2 + 2654^2 .

It is a cyclic number.

It is not a de Polignac number, because 121640741 - 2⁶ = 121640677 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121640741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121640791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60820370 + 60820371.

It is an arithmetic number, because the mean of its divisors is an integer number (60820371).

Almost surely, 2^121640741 is an apocalyptic number.

It is an amenable number.

121640741 is a deficient number, since it is larger than the sum of its proper divisors (1).

121640741 is an equidigital number, since it uses as much as digits as its factorization.

121640741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 121640741 is about 11029.0861362127. The cubic root of 121640741 is about 495.4802549151.

Adding to 121640741 its reverse (147046121), we get a palindrome (268686862).

The spelling of 121640741 in words is "one hundred twenty-one million, six hundred forty thousand, seven hundred forty-one".