202118987 has 4 divisors (see below), whose sum is σ = 230993136. Its totient is φ = 173244840.

The previous prime is 202118929. The next prime is 202118989. The reversal of 202118987 is 789811202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789811202 = 2 ⋅394905601.

It is a cyclic number.

It is not a de Polignac number, because 202118987 - 2⁸ = 202118731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202118987.

It is not an unprimeable number, because it can be changed into a prime (202118989) 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, 14437064 + ... + 14437077.

It is an arithmetic number, because the mean of its divisors is an integer number (57748284).

Almost surely, 2^202118987 is an apocalyptic number.

202118987 is a deficient number, since it is larger than the sum of its proper divisors (28874149).

202118987 is an equidigital number, since it uses as much as digits as its factorization.

202118987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28874148.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 202118987 is about 14216.8557353586. The cubic root of 202118987 is about 586.8616148277.

The spelling of 202118987 in words is "two hundred two million, one hundred eighteen thousand, nine hundred eighty-seven".