201891986 has 8 divisors (see below), whose sum is σ = 318776880. Its totient is φ = 95633028.

The previous prime is 201891959. The next prime is 201892049. The reversal of 201891986 is 689198102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×201891986² = 81520748022048392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2656436 + ... + 2656511.

It is an arithmetic number, because the mean of its divisors is an integer number (39847110).

Almost surely, 2^201891986 is an apocalyptic number.

201891986 is a deficient number, since it is larger than the sum of its proper divisors (116884894).

201891986 is a wasteful number, since it uses less digits than its factorization.

201891986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5312968.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 201891986 is about 14208.8699761804. The cubic root of 201891986 is about 586.6418299718.

The spelling of 201891986 in words is "two hundred one million, eight hundred ninety-one thousand, nine hundred eighty-six".