31662091 has 2 divisors, whose sum is σ = 31662092. Its totient is φ = 31662090.

The previous prime is 31662089. The next prime is 31662101. The reversal of 31662091 is 19026613.

It is a weak prime.

It is an emirp because it is prime and its reverse (19026613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31662091 - 2¹ = 31662089 is a prime.

Together with 31662089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31662991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15831045 + 15831046.

It is an arithmetic number, because the mean of its divisors is an integer number (15831046).

Almost surely, 2^31662091 is an apocalyptic number.

31662091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31662091 is an equidigital number, since it uses as much as digits as its factorization.

31662091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 31662091 is about 5626.9077653717. The cubic root of 31662091 is about 316.3587597411.

The spelling of 31662091 in words is "thirty-one million, six hundred sixty-two thousand, ninety-one".