121564393 has 2 divisors, whose sum is σ = 121564394. Its totient is φ = 121564392.

The previous prime is 121564381. The next prime is 121564441. The reversal of 121564393 is 393465121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84695209 + 36869184 = 9203^2 + 6072^2 .

It is a cyclic number.

It is not a de Polignac number, because 121564393 - 2¹⁷ = 121433321 is a prime.

It is not a weakly prime, because it can be changed into another prime (121564193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60782196 + 60782197.

It is an arithmetic number, because the mean of its divisors is an integer number (60782197).

Almost surely, 2^121564393 is an apocalyptic number.

It is an amenable number.

121564393 is a deficient number, since it is larger than the sum of its proper divisors (1).

121564393 is an equidigital number, since it uses as much as digits as its factorization.

121564393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 121564393 is about 11025.6243814126. The cubic root of 121564393 is about 495.3765702356.

The spelling of 121564393 in words is "one hundred twenty-one million, five hundred sixty-four thousand, three hundred ninety-three".