31436641 has 2 divisors, whose sum is σ = 31436642. Its totient is φ = 31436640.

The previous prime is 31436617. The next prime is 31436651. The reversal of 31436641 is 14663413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 1679616 = 5455^2 + 1296^2 .

It is an emirp because it is prime and its reverse (14663413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31436641 - 2⁹ = 31436129 is a prime.

It is not a weakly prime, because it can be changed into another prime (31436651) 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, 15718320 + 15718321.

It is an arithmetic number, because the mean of its divisors is an integer number (15718321).

Almost surely, 2^31436641 is an apocalyptic number.

It is an amenable number.

31436641 is a deficient number, since it is larger than the sum of its proper divisors (1).

31436641 is an equidigital number, since it uses as much as digits as its factorization.

31436641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 31436641 is about 5606.8387706443. The cubic root of 31436641 is about 315.6060926621.

The spelling of 31436641 in words is "thirty-one million, four hundred thirty-six thousand, six hundred forty-one".