31145543440 has 160 divisors (see below), whose sum is σ = 80711655552. Its totient is φ = 11082240000.

The previous prime is 31145543437. The next prime is 31145543467. The reversal of 31145543440 is 4434554113.

It is a junction number, because it is equal to n+sod(n) for n = 31145543396 and 31145543405.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8413590 + ... + 8417290.

Almost surely, 2^31145543440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31145543440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40355827776).

31145543440 is an abundant number, since it is smaller than the sum of its proper divisors (49566112112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31145543440 is a wasteful number, since it uses less digits than its factorization.

31145543440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929 (or 3923 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 31145543440 in words is "thirty-one billion, one hundred forty-five million, five hundred forty-three thousand, four hundred forty".