121693643 has 2 divisors, whose sum is σ = 121693644. Its totient is φ = 121693642.

The previous prime is 121693639. The next prime is 121693661. The reversal of 121693643 is 346396121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (346396121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121693643 - 2² = 121693639 is a prime.

It is a super-2 number, since 2×121693643² = 29618685493222898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121693343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60846821 + 60846822.

It is an arithmetic number, because the mean of its divisors is an integer number (60846822).

Almost surely, 2^121693643 is an apocalyptic number.

121693643 is a deficient number, since it is larger than the sum of its proper divisors (1).

121693643 is an equidigital number, since it uses as much as digits as its factorization.

121693643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 35.

The square root of 121693643 is about 11031.4841703191. The cubic root of 121693643 is about 495.5520732255.

The spelling of 121693643 in words is "one hundred twenty-one million, six hundred ninety-three thousand, six hundred forty-three".