31443780745 has 16 divisors (see below), whose sum is σ = 41580044352. Its totient is φ = 22680020160.

The previous prime is 31443780743. The next prime is 31443780761. The reversal of 31443780745 is 54708734413.

It is not a de Polignac number, because 31443780745 - 2¹ = 31443780743 is a prime.

It is a super-2 number, since 2×31443780745² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31443780695 and 31443780704.

It is not an unprimeable number, because it can be changed into a prime (31443780743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5622211 + ... + 5627800.

It is an arithmetic number, because the mean of its divisors is an integer number (2598752772).

Almost surely, 2^31443780745 is an apocalyptic number.

It is an amenable number.

31443780745 is a deficient number, since it is larger than the sum of its proper divisors (10136263607).

31443780745 is a wasteful number, since it uses less digits than its factorization.

31443780745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11250072.

The product of its (nonzero) digits is 1128960, while the sum is 46.

The spelling of 31443780745 in words is "thirty-one billion, four hundred forty-three million, seven hundred eighty thousand, seven hundred forty-five".