189902901 has 4 divisors (see below), whose sum is σ = 253203872. Its totient is φ = 126601932.

The previous prime is 189902899. The next prime is 189902917. The reversal of 189902901 is 109209981.

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 not a de Polignac number, because 189902901 - 2¹ = 189902899 is a prime.

It is a super-2 number, since 2×189902901² = 72126223616431602, which contains 22 as substring.

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 189902901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189902501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31650481 + ... + 31650486.

It is an arithmetic number, because the mean of its divisors is an integer number (63300968).

Almost surely, 2^189902901 is an apocalyptic number.

It is an amenable number.

189902901 is a deficient number, since it is larger than the sum of its proper divisors (63300971).

189902901 is an equidigital number, since it uses as much as digits as its factorization.

189902901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63300970.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 189902901 is about 13780.5261510582. The cubic root of 189902901 is about 574.7917592497.

The spelling of 189902901 in words is "one hundred eighty-nine million, nine hundred two thousand, nine hundred one".