31404563 has 2 divisors, whose sum is σ = 31404564. Its totient is φ = 31404562.

The previous prime is 31404523. The next prime is 31404589. The reversal of 31404563 is 36540413.

It is an a-pointer prime, because the next prime (31404589) can be obtained adding 31404563 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31404563 - 2²² = 27210259 is a prime.

It is not a weakly prime, because it can be changed into another prime (31404523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702281 + 15702282.

It is an arithmetic number, because the mean of its divisors is an integer number (15702282).

Almost surely, 2^31404563 is an apocalyptic number.

31404563 is a deficient number, since it is larger than the sum of its proper divisors (1).

31404563 is an equidigital number, since it uses as much as digits as its factorization.

31404563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 31404563 is about 5603.9774267925. The cubic root of 31404563 is about 315.4987078039.

Adding to 31404563 its reverse (36540413), we get a palindrome (67944976).

The spelling of 31404563 in words is "thirty-one million, four hundred four thousand, five hundred sixty-three".