27251991 has 16 divisors (see below), whose sum is σ = 43479520. Its totient is φ = 16770240.

The previous prime is 27251989. The next prime is 27251993. The reversal of 27251991 is 19915272.

It is an interprime number because it is at equal distance from previous prime (27251989) and next prime (27251993).

It is not a de Polignac number, because 27251991 - 2¹ = 27251989 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 (27251993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38470 + ... + 39171.

It is an arithmetic number, because the mean of its divisors is an integer number (2717470).

Almost surely, 2^27251991 is an apocalyptic number.

27251991 is a deficient number, since it is larger than the sum of its proper divisors (16227529).

27251991 is a wasteful number, since it uses less digits than its factorization.

27251991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77663 (or 77657 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 27251991 is about 5220.3439541854. The cubic root of 27251991 is about 300.9304114653.

The spelling of 27251991 in words is "twenty-seven million, two hundred fifty-one thousand, nine hundred ninety-one".