121512491 has 2 divisors, whose sum is σ = 121512492. Its totient is φ = 121512490.

The previous prime is 121512487. The next prime is 121512493. The reversal of 121512491 is 194215121.

It is a strong prime.

It is an emirp because it is prime and its reverse (194215121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121512491 - 2² = 121512487 is a prime.

Together with 121512493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121512491.

It is not a weakly prime, because it can be changed into another prime (121512493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60756245 + 60756246.

It is an arithmetic number, because the mean of its divisors is an integer number (60756246).

Almost surely, 2^121512491 is an apocalyptic number.

121512491 is a deficient number, since it is larger than the sum of its proper divisors (1).

121512491 is an equidigital number, since it uses as much as digits as its factorization.

121512491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 121512491 is about 11023.2704312287. The cubic root of 121512491 is about 495.3060597457.

The spelling of 121512491 in words is "one hundred twenty-one million, five hundred twelve thousand, four hundred ninety-one".