121542643 has 2 divisors, whose sum is σ = 121542644. Its totient is φ = 121542642.

The previous prime is 121542613. The next prime is 121542653. The reversal of 121542643 is 346245121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121542643 is a prime.

It is a super-2 number, since 2×121542643² = 29545228134850898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121542613) 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, 60771321 + 60771322.

It is an arithmetic number, because the mean of its divisors is an integer number (60771322).

Almost surely, 2^121542643 is an apocalyptic number.

121542643 is a deficient number, since it is larger than the sum of its proper divisors (1).

121542643 is an equidigital number, since it uses as much as digits as its factorization.

121542643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 28.

The square root of 121542643 is about 11024.6379985921. The cubic root of 121542643 is about 495.3470246240.

Adding to 121542643 its reverse (346245121), we get a palindrome (467787764).

The spelling of 121542643 in words is "one hundred twenty-one million, five hundred forty-two thousand, six hundred forty-three".