31285061 has 2 divisors, whose sum is σ = 31285062. Its totient is φ = 31285060.

The previous prime is 31285043. The next prime is 31285063. The reversal of 31285061 is 16058213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25060036 + 6225025 = 5006^2 + 2495^2 .

It is an emirp because it is prime and its reverse (16058213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31285061 is a prime.

Together with 31285063, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31285061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31285063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15642530 + 15642531.

It is an arithmetic number, because the mean of its divisors is an integer number (15642531).

Almost surely, 2^31285061 is an apocalyptic number.

It is an amenable number.

31285061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31285061 is an equidigital number, since it uses as much as digits as its factorization.

31285061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 31285061 is about 5593.3050158203. The cubic root of 31285061 is about 315.0980160252.

The spelling of 31285061 in words is "thirty-one million, two hundred eighty-five thousand, sixty-one".