31212541989 has 48 divisors (see below), whose sum is σ = 47343284352. Its totient is φ = 19777912704.

The previous prime is 31212541931. The next prime is 31212541993. The reversal of 31212541989 is 98914521213.

31212541989 is a `hidden beast` number, since 3 + 1 + 2 + 12 + 541 + 98 + 9 = 666.

It is not a de Polignac number, because 31212541989 - 2¹² = 31212537893 is a prime.

It is a super-2 number, since 2×31212541989² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212541189) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39162139 + ... + 39162935.

It is an arithmetic number, because the mean of its divisors is an integer number (986318424).

Almost surely, 2^31212541989 is an apocalyptic number.

It is an amenable number.

31212541989 is a deficient number, since it is larger than the sum of its proper divisors (16130742363).

31212541989 is a wasteful number, since it uses less digits than its factorization.

31212541989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786 (or 1783 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The spelling of 31212541989 in words is "thirty-one billion, two hundred twelve million, five hundred forty-one thousand, nine hundred eighty-nine".