121664361 has 16 divisors (see below), whose sum is σ = 199654784. Its totient is φ = 64174464.

The previous prime is 121664351. The next prime is 121664371. The reversal of 121664361 is 163466121.

It is an interprime number because it is at equal distance from previous prime (121664351) and next prime (121664371).

It is not a de Polignac number, because 121664361 - 2⁷ = 121664233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121664351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222556 + ... + 223101.

It is an arithmetic number, because the mean of its divisors is an integer number (12478424).

Almost surely, 2^121664361 is an apocalyptic number.

It is an amenable number.

121664361 is a deficient number, since it is larger than the sum of its proper divisors (77990423).

121664361 is a wasteful number, since it uses less digits than its factorization.

121664361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445680.

The product of its digits is 5184, while the sum is 30.

The square root of 121664361 is about 11030.1568891834. The cubic root of 121664361 is about 495.5123233545.

The spelling of 121664361 in words is "one hundred twenty-one million, six hundred sixty-four thousand, three hundred sixty-one".