31440306643 has 8 divisors (see below), whose sum is σ = 32011721456. Its totient is φ = 30870698400.

The previous prime is 31440306631. The next prime is 31440306661. The reversal of 31440306643 is 34660304413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31440306643 - 2¹³ = 31440298451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31440306599 and 31440306608.

It is not an unprimeable number, because it can be changed into a prime (31440306043) 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 in 7 ways as a sum of consecutive naturals, for example, 416496 + ... + 486157.

It is an arithmetic number, because the mean of its divisors is an integer number (4001465182).

Almost surely, 2^31440306643 is an apocalyptic number.

31440306643 is a deficient number, since it is larger than the sum of its proper divisors (571414813).

31440306643 is an equidigital number, since it uses as much as digits as its factorization.

31440306643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903285.

The product of its (nonzero) digits is 62208, while the sum is 34.

The spelling of 31440306643 in words is "thirty-one billion, four hundred forty million, three hundred six thousand, six hundred forty-three".