31639061 has 2 divisors, whose sum is σ = 31639062. Its totient is φ = 31639060.

The previous prime is 31639051. The next prime is 31639067. The reversal of 31639061 is 16093613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 4024036 = 5255^2 + 2006^2 .

It is an emirp because it is prime and its reverse (16093613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31639061 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31639067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15819530 + 15819531.

It is an arithmetic number, because the mean of its divisors is an integer number (15819531).

Almost surely, 2^31639061 is an apocalyptic number.

It is an amenable number.

31639061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31639061 is an equidigital number, since it uses as much as digits as its factorization.

31639061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 31639061 is about 5624.8609760598. The cubic root of 31639061 is about 316.2820380297.

The spelling of 31639061 in words is "thirty-one million, six hundred thirty-nine thousand, sixty-one".