121500541 has 2 divisors, whose sum is σ = 121500542. Its totient is φ = 121500540.

The previous prime is 121500527. The next prime is 121500557. The reversal of 121500541 is 145005121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 43178041 = 8850^2 + 6571^2 .

It is a cyclic number.

It is not a de Polignac number, because 121500541 - 2¹⁹ = 120976253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121500521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60750270 + 60750271.

It is an arithmetic number, because the mean of its divisors is an integer number (60750271).

Almost surely, 2^121500541 is an apocalyptic number.

It is an amenable number.

121500541 is a deficient number, since it is larger than the sum of its proper divisors (1).

121500541 is an equidigital number, since it uses as much as digits as its factorization.

121500541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 121500541 is about 11022.7283827553. The cubic root of 121500541 is about 495.2898224535.

Adding to 121500541 its reverse (145005121), we get a palindrome (266505662).

The spelling of 121500541 in words is "one hundred twenty-one million, five hundred thousand, five hundred forty-one".