31380563 has 2 divisors, whose sum is σ = 31380564. Its totient is φ = 31380562.

The previous prime is 31380541. The next prime is 31380607. The reversal of 31380563 is 36508313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31380563 - 2¹⁸ = 31118419 is a prime.

It is not a weakly prime, because it can be changed into another prime (31310563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15690281 + 15690282.

It is an arithmetic number, because the mean of its divisors is an integer number (15690282).

Almost surely, 2^31380563 is an apocalyptic number.

31380563 is a deficient number, since it is larger than the sum of its proper divisors (1).

31380563 is an equidigital number, since it uses as much as digits as its factorization.

31380563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 31380563 is about 5601.8356812745. The cubic root of 31380563 is about 315.4183171646.

Adding to 31380563 its reverse (36508313), we get a palindrome (67888876).

The spelling of 31380563 in words is "thirty-one million, three hundred eighty thousand, five hundred sixty-three".