31556141 has 2 divisors, whose sum is σ = 31556142. Its totient is φ = 31556140.

The previous prime is 31556113. The next prime is 31556143. The reversal of 31556141 is 14165513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23319241 + 8236900 = 4829^2 + 2870^2 .

It is an emirp because it is prime and its reverse (14165513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31556141 - 2¹⁴ = 31539757 is a prime.

Together with 31556143, 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 31556141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31556143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15778070 + 15778071.

It is an arithmetic number, because the mean of its divisors is an integer number (15778071).

Almost surely, 2^31556141 is an apocalyptic number.

It is an amenable number.

31556141 is a deficient number, since it is larger than the sum of its proper divisors (1).

31556141 is an equidigital number, since it uses as much as digits as its factorization.

31556141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 31556141 is about 5617.4852914805. The cubic root of 31556141 is about 316.0054911453.

The spelling of 31556141 in words is "thirty-one million, five hundred fifty-six thousand, one hundred forty-one".