31610445221 has 2 divisors, whose sum is σ = 31610445222. Its totient is φ = 31610445220.

The previous prime is 31610445173. The next prime is 31610445227. The reversal of 31610445221 is 12254401613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31572314596 + 38130625 = 177686^2 + 6175^2 .

It is a cyclic number.

It is not a de Polignac number, because 31610445221 - 2³⁰ = 30536703397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31610445227) 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, 15805222610 + 15805222611.

It is an arithmetic number, because the mean of its divisors is an integer number (15805222611).

Almost surely, 2^31610445221 is an apocalyptic number.

It is an amenable number.

31610445221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31610445221 is an equidigital number, since it uses as much as digits as its factorization.

31610445221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 31610445221 its reverse (12254401613), we get a palindrome (43864846834).

The spelling of 31610445221 in words is "thirty-one billion, six hundred ten million, four hundred forty-five thousand, two hundred twenty-one".