27101991 has 8 divisors (see below), whose sum is σ = 41298304. Its totient is φ = 15486840.

The previous prime is 27101989. The next prime is 27102001. The reversal of 27101991 is 19910172.

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

It is not a de Polignac number, because 27101991 - 2¹ = 27101989 is a prime.

It is a super-3 number, since 3×27101991³ (a number of 23 digits) contains 333 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 (27101941) 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, 645265 + ... + 645306.

It is an arithmetic number, because the mean of its divisors is an integer number (5162288).

Almost surely, 2^27101991 is an apocalyptic number.

27101991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

27101991 is a deficient number, since it is larger than the sum of its proper divisors (14196313).

27101991 is a wasteful number, since it uses less digits than its factorization.

27101991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290581.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 27101991 is about 5205.9572606774. The cubic root of 27101991 is about 300.3772698039.

The spelling of 27101991 in words is "twenty-seven million, one hundred one thousand, nine hundred ninety-one".