121818451 has 2 divisors, whose sum is σ = 121818452. Its totient is φ = 121818450.

The previous prime is 121818449. The next prime is 121818457. The reversal of 121818451 is 154818121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121818451 - 2¹ = 121818449 is a prime.

Together with 121818449, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121818457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60909225 + 60909226.

It is an arithmetic number, because the mean of its divisors is an integer number (60909226).

Almost surely, 2^121818451 is an apocalyptic number.

121818451 is the 6981-st centered pentagonal number.

121818451 is a deficient number, since it is larger than the sum of its proper divisors (1).

121818451 is an equidigital number, since it uses as much as digits as its factorization.

121818451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 31.

The square root of 121818451 is about 11037.1396203908. The cubic root of 121818451 is about 495.7214267205.

The spelling of 121818451 in words is "one hundred twenty-one million, eight hundred eighteen thousand, four hundred fifty-one".