31411661 has 2 divisors, whose sum is σ = 31411662. Its totient is φ = 31411660.

The previous prime is 31411619. The next prime is 31411663. The reversal of 31411661 is 16611413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28153636 + 3258025 = 5306^2 + 1805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31411661 is a prime.

Together with 31411663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31411663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15705830 + 15705831.

It is an arithmetic number, because the mean of its divisors is an integer number (15705831).

Almost surely, 2^31411661 is an apocalyptic number.

It is an amenable number.

31411661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31411661 is an equidigital number, since it uses as much as digits as its factorization.

31411661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 31411661 is about 5604.6106912077. The cubic root of 31411661 is about 315.5224754873.

The spelling of 31411661 in words is "thirty-one million, four hundred eleven thousand, six hundred sixty-one".