121619647 has 2 divisors, whose sum is σ = 121619648. Its totient is φ = 121619646.

The previous prime is 121619621. The next prime is 121619677. The reversal of 121619647 is 746916121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121619647 - 2²³ = 113231039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121619677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60809823 + 60809824.

It is an arithmetic number, because the mean of its divisors is an integer number (60809824).

Almost surely, 2^121619647 is an apocalyptic number.

121619647 is a deficient number, since it is larger than the sum of its proper divisors (1).

121619647 is an equidigital number, since it uses as much as digits as its factorization.

121619647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 121619647 is about 11028.1298051846. The cubic root of 121619647 is about 495.4516124701.

The spelling of 121619647 in words is "one hundred twenty-one million, six hundred nineteen thousand, six hundred forty-seven".