201387091 has 4 divisors (see below), whose sum is σ = 201621312. Its totient is φ = 201152872.

The previous prime is 201387077. The next prime is 201387097. The reversal of 201387091 is 190783102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190783102 = 2 ⋅95391551.

It is a cyclic number.

It is not a de Polignac number, because 201387091 - 2¹³ = 201378899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201387097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115816 + ... + 117541.

It is an arithmetic number, because the mean of its divisors is an integer number (50405328).

Almost surely, 2^201387091 is an apocalyptic number.

201387091 is a deficient number, since it is larger than the sum of its proper divisors (234221).

201387091 is an equidigital number, since it uses as much as digits as its factorization.

201387091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234220.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 201387091 is about 14191.0919593948. The cubic root of 201387091 is about 586.1523937077.

The spelling of 201387091 in words is "two hundred one million, three hundred eighty-seven thousand, ninety-one".