27142991 has 6 divisors (see below), whose sum is σ = 27337680. Its totient is φ = 26949216.

The previous prime is 27142957. The next prime is 27143021. The reversal of 27142991 is 19924172.

It is a de Polignac number, because none of the positive numbers 2^k-27142991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27142901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 80375 + ... + 80711.

It is an arithmetic number, because the mean of its divisors is an integer number (4556280).

Almost surely, 2^27142991 is an apocalyptic number.

27142991 is a deficient number, since it is larger than the sum of its proper divisors (194689).

27142991 is an frugal number, since it uses more digits than its factorization.

27142991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 576 counting only the distinct ones).

The product of its digits is 9072, while the sum is 35.

The square root of 27142991 is about 5209.8935689705. The cubic root of 27142991 is about 300.5286641299.

The spelling of 27142991 in words is "twenty-seven million, one hundred forty-two thousand, nine hundred ninety-one".