31554493 has 2 divisors, whose sum is σ = 31554494. Its totient is φ = 31554492.

The previous prime is 31554473. The next prime is 31554511. The reversal of 31554493 is 39445513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28068804 + 3485689 = 5298^2 + 1867^2 .

It is a cyclic number.

It is not a de Polignac number, because 31554493 - 2¹³ = 31546301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31554433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15777246 + 15777247.

It is an arithmetic number, because the mean of its divisors is an integer number (15777247).

Almost surely, 2^31554493 is an apocalyptic number.

It is an amenable number.

31554493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31554493 is an equidigital number, since it uses as much as digits as its factorization.

31554493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 31554493 is about 5617.3386047131. The cubic root of 31554493 is about 315.9999899856. Note that the first 4 decimals are identical.

The spelling of 31554493 in words is "thirty-one million, five hundred fifty-four thousand, four hundred ninety-three".