121899647 has 2 divisors, whose sum is σ = 121899648. Its totient is φ = 121899646.

The previous prime is 121899641. The next prime is 121899653. The reversal of 121899647 is 746998121.

It is a balanced prime because it is at equal distance from previous prime (121899641) and next prime (121899653).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121899647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121899641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60949823 + 60949824.

It is an arithmetic number, because the mean of its divisors is an integer number (60949824).

Almost surely, 2^121899647 is an apocalyptic number.

121899647 is a deficient number, since it is larger than the sum of its proper divisors (1).

121899647 is an equidigital number, since it uses as much as digits as its factorization.

121899647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 121899647 is about 11040.8173157606. The cubic root of 121899647 is about 495.8315404654.

The spelling of 121899647 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, six hundred forty-seven".