31288105949 has 2 divisors, whose sum is σ = 31288105950. Its totient is φ = 31288105948.

The previous prime is 31288105939. The next prime is 31288105969. The reversal of 31288105949 is 94950188213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30934477924 + 353628025 = 175882^2 + 18805^2 .

It is a cyclic number.

It is not a de Polignac number, because 31288105949 - 2¹² = 31288101853 is a prime.

It is a super-4 number, since 4×31288105949⁴ (a number of 43 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31288105897 and 31288105906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31288105939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15644052974 + 15644052975.

It is an arithmetic number, because the mean of its divisors is an integer number (15644052975).

Almost surely, 2^31288105949 is an apocalyptic number.

It is an amenable number.

31288105949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31288105949 is an equidigital number, since it uses as much as digits as its factorization.

31288105949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 31288105949 in words is "thirty-one billion, two hundred eighty-eight million, one hundred five thousand, nine hundred forty-nine".