121664613 has 8 divisors (see below), whose sum is σ = 185393728. Its totient is φ = 69522624.

The previous prime is 121664591. The next prime is 121664633. The reversal of 121664613 is 316466121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121664613 - 2¹⁸ = 121402469 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 (121664633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2896756 + ... + 2896797.

It is an arithmetic number, because the mean of its divisors is an integer number (23174216).

Almost surely, 2^121664613 is an apocalyptic number.

It is an amenable number.

121664613 is a deficient number, since it is larger than the sum of its proper divisors (63729115).

121664613 is an equidigital number, since it uses as much as digits as its factorization.

121664613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5793563.

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

The square root of 121664613 is about 11030.1683124058. The cubic root of 121664613 is about 495.5126654679.

The spelling of 121664613 in words is "one hundred twenty-one million, six hundred sixty-four thousand, six hundred thirteen".