121564511 has 2 divisors, whose sum is σ = 121564512. Its totient is φ = 121564510.

The previous prime is 121564493. The next prime is 121564529. The reversal of 121564511 is 115465121.

It is a balanced prime because it is at equal distance from previous prime (121564493) and next prime (121564529).

It is an emirp because it is prime and its reverse (115465121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121564511 - 2⁶ = 121564447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121524511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60782255 + 60782256.

It is an arithmetic number, because the mean of its divisors is an integer number (60782256).

Almost surely, 2^121564511 is an apocalyptic number.

121564511 is a deficient number, since it is larger than the sum of its proper divisors (1).

121564511 is an equidigital number, since it uses as much as digits as its factorization.

121564511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 26.

The square root of 121564511 is about 11025.6297325822. The cubic root of 121564511 is about 495.3767305195.

The spelling of 121564511 in words is "one hundred twenty-one million, five hundred sixty-four thousand, five hundred eleven".