31802612749 has 2 divisors, whose sum is σ = 31802612750. Its totient is φ = 31802612748.

The previous prime is 31802612689. The next prime is 31802612869. The reversal of 31802612749 is 94721620813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23151752649 + 8650860100 = 152157^2 + 93010^2 .

It is a cyclic number.

It is not a de Polignac number, because 31802612749 - 2¹³ = 31802604557 is a prime.

It is a super-2 number, since 2×31802612749² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31802615749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15901306374 + 15901306375.

It is an arithmetic number, because the mean of its divisors is an integer number (15901306375).

Almost surely, 2^31802612749 is an apocalyptic number.

It is an amenable number.

31802612749 is a deficient number, since it is larger than the sum of its proper divisors (1).

31802612749 is an equidigital number, since it uses as much as digits as its factorization.

31802612749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 31802612749 in words is "thirty-one billion, eight hundred two million, six hundred twelve thousand, seven hundred forty-nine".