31330212989 has 4 divisors (see below), whose sum is σ = 31843823100. Its totient is φ = 30816602880.

The previous prime is 31330212971. The next prime is 31330212997. The reversal of 31330212989 is 98921203313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17780088964 + 13550124025 = 133342^2 + 116405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31330212989 is a prime.

It is a super-2 number, since 2×31330212989² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330211989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256804964 + ... + 256805085.

It is an arithmetic number, because the mean of its divisors is an integer number (7960955775).

Almost surely, 2^31330212989 is an apocalyptic number.

It is an amenable number.

31330212989 is a deficient number, since it is larger than the sum of its proper divisors (513610111).

31330212989 is an equidigital number, since it uses as much as digits as its factorization.

31330212989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513610110.

The product of its (nonzero) digits is 69984, while the sum is 41.

The spelling of 31330212989 in words is "thirty-one billion, three hundred thirty million, two hundred twelve thousand, nine hundred eighty-nine".