31661849 has 2 divisors, whose sum is σ = 31661850. Its totient is φ = 31661848.

The previous prime is 31661821. The next prime is 31661863. The reversal of 31661849 is 94816613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19009600 + 12652249 = 4360^2 + 3557^2 .

It is a cyclic number.

It is not a de Polignac number, because 31661849 - 2¹² = 31657753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31661549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15830924 + 15830925.

It is an arithmetic number, because the mean of its divisors is an integer number (15830925).

Almost surely, 2^31661849 is an apocalyptic number.

It is an amenable number.

31661849 is a deficient number, since it is larger than the sum of its proper divisors (1).

31661849 is an equidigital number, since it uses as much as digits as its factorization.

31661849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 31661849 is about 5626.8862615127. The cubic root of 31661849 is about 316.3579537403.

The spelling of 31661849 in words is "thirty-one million, six hundred sixty-one thousand, eight hundred forty-nine".