121562543 has 2 divisors, whose sum is σ = 121562544. Its totient is φ = 121562542.

The previous prime is 121562509. The next prime is 121562561. The reversal of 121562543 is 345265121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121562543 - 2²⁴ = 104785327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121562503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60781271 + 60781272.

It is an arithmetic number, because the mean of its divisors is an integer number (60781272).

Almost surely, 2^121562543 is an apocalyptic number.

121562543 is a deficient number, since it is larger than the sum of its proper divisors (1).

121562543 is an equidigital number, since it uses as much as digits as its factorization.

121562543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The square root of 121562543 is about 11025.5404856179. The cubic root of 121562543 is about 495.3740572978.

The spelling of 121562543 in words is "one hundred twenty-one million, five hundred sixty-two thousand, five hundred forty-three".