121664479 has 2 divisors, whose sum is σ = 121664480. Its totient is φ = 121664478.

The previous prime is 121664453. The next prime is 121664519. The reversal of 121664479 is 974466121.

It is an a-pointer prime, because the next prime (121664519) can be obtained adding 121664479 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121664479 - 2⁵ = 121664447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121664419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60832239 + 60832240.

It is an arithmetic number, because the mean of its divisors is an integer number (60832240).

Almost surely, 2^121664479 is an apocalyptic number.

121664479 is a deficient number, since it is larger than the sum of its proper divisors (1).

121664479 is an equidigital number, since it uses as much as digits as its factorization.

121664479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 121664479 is about 11030.1622381541. The cubic root of 121664479 is about 495.5124835505.

The spelling of 121664479 in words is "one hundred twenty-one million, six hundred sixty-four thousand, four hundred seventy-nine".