121664887 has 4 divisors (see below), whose sum is σ = 121730400. Its totient is φ = 121599376.

The previous prime is 121664867. The next prime is 121664897. The reversal of 121664887 is 788466121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121664887 - 2²³ = 113276279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121664827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29887 + ... + 33712.

It is an arithmetic number, because the mean of its divisors is an integer number (30432600).

Almost surely, 2^121664887 is an apocalyptic number.

121664887 is a deficient number, since it is larger than the sum of its proper divisors (65513).

121664887 is an equidigital number, since it uses as much as digits as its factorization.

121664887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65512.

The product of its digits is 129024, while the sum is 43.

The square root of 121664887 is about 11030.1807328801. The cubic root of 121664887 is about 495.5130374478.

The spelling of 121664887 in words is "one hundred twenty-one million, six hundred sixty-four thousand, eight hundred eighty-seven".