121542523 has 2 divisors, whose sum is σ = 121542524. Its totient is φ = 121542522.

The previous prime is 121542493. The next prime is 121542559. The reversal of 121542523 is 325245121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121542523 - 2⁹ = 121542011 is a prime.

It is not a weakly prime, because it can be changed into another prime (121542023) 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, 60771261 + 60771262.

It is an arithmetic number, because the mean of its divisors is an integer number (60771262).

Almost surely, 2^121542523 is an apocalyptic number.

121542523 is a deficient number, since it is larger than the sum of its proper divisors (1).

121542523 is an equidigital number, since it uses as much as digits as its factorization.

121542523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 121542523 is about 11024.6325562352. The cubic root of 121542523 is about 495.3468616039.

Adding to 121542523 its reverse (325245121), we get a palindrome (446787644).

The spelling of 121542523 in words is "one hundred twenty-one million, five hundred forty-two thousand, five hundred twenty-three".