121561653 has 8 divisors (see below), whose sum is σ = 164829600. Its totient is φ = 79667408.

The previous prime is 121561637. The next prime is 121561669. The reversal of 121561653 is 356165121.

It is an interprime number because it is at equal distance from previous prime (121561637) and next prime (121561669).

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

It is a cyclic number.

It is not a de Polignac number, because 121561653 - 2⁴ = 121561637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121561653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121561603) 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, 343218 + ... + 343571.

It is an arithmetic number, because the mean of its divisors is an integer number (20603700).

Almost surely, 2^121561653 is an apocalyptic number.

It is an amenable number.

121561653 is a deficient number, since it is larger than the sum of its proper divisors (43267947).

121561653 is an equidigital number, since it uses as much as digits as its factorization.

121561653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686851.

The product of its digits is 5400, while the sum is 30.

The square root of 121561653 is about 11025.5001247109. The cubic root of 121561653 is about 495.3728483618.

The spelling of 121561653 in words is "one hundred twenty-one million, five hundred sixty-one thousand, six hundred fifty-three".