31819067549 has 2 divisors, whose sum is σ = 31819067550. Its totient is φ = 31819067548.

The previous prime is 31819067521. The next prime is 31819067653. The reversal of 31819067549 is 94576091813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28893880324 + 2925187225 = 169982^2 + 54085^2 .

It is a cyclic number.

It is not a de Polignac number, because 31819067549 - 2¹² = 31819063453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31819067549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31819067509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15909533774 + 15909533775.

It is an arithmetic number, because the mean of its divisors is an integer number (15909533775).

Almost surely, 2^31819067549 is an apocalyptic number.

It is an amenable number.

31819067549 is a deficient number, since it is larger than the sum of its proper divisors (1).

31819067549 is an equidigital number, since it uses as much as digits as its factorization.

31819067549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 31819067549 in words is "thirty-one billion, eight hundred nineteen million, sixty-seven thousand, five hundred forty-nine".