31905248489 has 4 divisors (see below), whose sum is σ = 32647231056. Its totient is φ = 31163265924.

The previous prime is 31905248461. The next prime is 31905248509. The reversal of 31905248489 is 98484250913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31905248489 is a prime.

It is a super-3 number, since 3×31905248489³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31905248489.

It is not an unprimeable number, because it can be changed into a prime (31905248429) 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, 370991219 + ... + 370991304.

It is an arithmetic number, because the mean of its divisors is an integer number (8161807764).

Almost surely, 2^31905248489 is an apocalyptic number.

It is an amenable number.

31905248489 is a deficient number, since it is larger than the sum of its proper divisors (741982567).

31905248489 is an equidigital number, since it uses as much as digits as its factorization.

31905248489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741982566.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 31905248489 in words is "thirty-one billion, nine hundred five million, two hundred forty-eight thousand, four hundred eighty-nine".