202113643 has 4 divisors (see below), whose sum is σ = 203353768. Its totient is φ = 200873520.

The previous prime is 202113619. The next prime is 202113649. The reversal of 202113643 is 346311202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346311202 = 2 ⋅173155601.

It is a cyclic number.

It is not a de Polignac number, because 202113643 - 2²⁵ = 168559211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202113649) 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, 619818 + ... + 620143.

It is an arithmetic number, because the mean of its divisors is an integer number (50838442).

Almost surely, 2^202113643 is an apocalyptic number.

202113643 is a deficient number, since it is larger than the sum of its proper divisors (1240125).

202113643 is a wasteful number, since it uses less digits than its factorization.

202113643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240124.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 202113643 is about 14216.6677881985. The cubic root of 202113643 is about 586.8564426003.

Adding to 202113643 its reverse (346311202), we get a palindrome (548424845).

The spelling of 202113643 in words is "two hundred two million, one hundred thirteen thousand, six hundred forty-three".