201991115 has 8 divisors (see below), whose sum is σ = 242466000. Its totient is φ = 161541792.

The previous prime is 201991099. The next prime is 201991117. The reversal of 201991115 is 511199102.

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

It is a cyclic number.

It is not a de Polignac number, because 201991115 - 2⁴ = 201991099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201991117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25232 + ... + 32258.

It is an arithmetic number, because the mean of its divisors is an integer number (30308250).

Almost surely, 2^201991115 is an apocalyptic number.

201991115 is a deficient number, since it is larger than the sum of its proper divisors (40474885).

201991115 is an equidigital number, since it uses as much as digits as its factorization.

201991115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12781.

The product of its (nonzero) digits is 810, while the sum is 29.

The square root of 201991115 is about 14212.3578269054. The cubic root of 201991115 is about 586.7378280085.

The spelling of 201991115 in words is "two hundred one million, nine hundred ninety-one thousand, one hundred fifteen".