27311931 has 8 divisors (see below), whose sum is σ = 40462160. Its totient is φ = 18207936.

The previous prime is 27311929. The next prime is 27311969. The reversal of 27311931 is 13911372.

It is not a de Polignac number, because 27311931 - 2¹ = 27311929 is a prime.

It is a super-2 number, since 2×27311931² = 1491883149897522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1011553 = 27311931 / (2 + 7 + 3 + 1 + 1 + 9 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27311895 and 27311904.

It is not an unprimeable number, because it can be changed into a prime (27311131) 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, 505750 + ... + 505803.

It is an arithmetic number, because the mean of its divisors is an integer number (5057770).

Almost surely, 2^27311931 is an apocalyptic number.

27311931 is a deficient number, since it is larger than the sum of its proper divisors (13150229).

27311931 is a wasteful number, since it uses less digits than its factorization.

27311931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011562 (or 1011556 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 27311931 is about 5226.0818018856. The cubic root of 27311931 is about 301.1508792772.

The spelling of 27311931 in words is "twenty-seven million, three hundred eleven thousand, nine hundred thirty-one".