102201989 has 4 divisors (see below), whose sum is σ = 102242400. Its totient is φ = 102161580.

The previous prime is 102201973. The next prime is 102201991. The reversal of 102201989 is 989102201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102201989 - 2⁴ = 102201973 is a prime.

It is a super-2 number, since 2×102201989² = 20890493111112242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221989) 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, 16139 + ... + 21560.

It is an arithmetic number, because the mean of its divisors is an integer number (25560600).

Almost surely, 2^102201989 is an apocalyptic number.

It is an amenable number.

102201989 is a deficient number, since it is larger than the sum of its proper divisors (40411).

102201989 is an equidigital number, since it uses as much as digits as its factorization.

102201989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40410.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 102201989 is about 10109.4999381770. The cubic root of 102201989 is about 467.5410874504.

The spelling of 102201989 in words is "one hundred two million, two hundred one thousand, nine hundred eighty-nine".