31298209549 has 2 divisors, whose sum is σ = 31298209550. Its totient is φ = 31298209548.

The previous prime is 31298209531. The next prime is 31298209571. The reversal of 31298209549 is 94590289213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19911185449 + 11387024100 = 141107^2 + 106710^2 .

It is a cyclic number.

It is not a de Polignac number, because 31298209549 - 2¹⁷ = 31298078477 is a prime.

It is a super-2 number, since 2×31298209549² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31298209496 and 31298209505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31298209589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15649104774 + 15649104775.

It is an arithmetic number, because the mean of its divisors is an integer number (15649104775).

Almost surely, 2^31298209549 is an apocalyptic number.

It is an amenable number.

31298209549 is a deficient number, since it is larger than the sum of its proper divisors (1).

31298209549 is an equidigital number, since it uses as much as digits as its factorization.

31298209549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 31298209549 in words is "thirty-one billion, two hundred ninety-eight million, two hundred nine thousand, five hundred forty-nine".