121816493 has 2 divisors, whose sum is σ = 121816494. Its totient is φ = 121816492.

The previous prime is 121816489. The next prime is 121816511. The reversal of 121816493 is 394618121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103266244 + 18550249 = 10162^2 + 4307^2 .

It is an emirp because it is prime and its reverse (394618121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121816493 - 2² = 121816489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121816193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60908246 + 60908247.

It is an arithmetic number, because the mean of its divisors is an integer number (60908247).

Almost surely, 2^121816493 is an apocalyptic number.

It is an amenable number.

121816493 is a deficient number, since it is larger than the sum of its proper divisors (1).

121816493 is an equidigital number, since it uses as much as digits as its factorization.

121816493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 121816493 is about 11037.0509195165. The cubic root of 121816493 is about 495.7187707798.

The spelling of 121816493 in words is "one hundred twenty-one million, eight hundred sixteen thousand, four hundred ninety-three".