31829988989 has 2 divisors, whose sum is σ = 31829988990. Its totient is φ = 31829988988.

The previous prime is 31829988973. The next prime is 31829989003. The reversal of 31829988989 is 98988992813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20928540889 + 10901448100 = 144667^2 + 104410^2 .

It is an emirp because it is prime and its reverse (98988992813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31829988989 - 2⁴ = 31829988973 is a prime.

It is a super-2 number, since 2×31829988989² (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 (31829988919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15914994494 + 15914994495.

It is an arithmetic number, because the mean of its divisors is an integer number (15914994495).

Almost surely, 2^31829988989 is an apocalyptic number.

It is an amenable number.

31829988989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31829988989 is an equidigital number, since it uses as much as digits as its factorization.

31829988989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161243136, while the sum is 74.

The spelling of 31829988989 in words is "thirty-one billion, eight hundred twenty-nine million, nine hundred eighty-eight thousand, nine hundred eighty-nine".