31442243643 has 24 divisors (see below), whose sum is σ = 45881901936. Its totient is φ = 20746872000.

The previous prime is 31442243621. The next prime is 31442243681. The reversal of 31442243643 is 34634224413.

31442243643 is a `hidden beast` number, since 3 + 1 + 4 + 4 + 2 + 2 + 4 + 3 + 643 = 666.

It is not a de Polignac number, because 31442243643 - 2¹⁴ = 31442227259 is a prime.

It is a super-2 number, since 2×31442243643² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31442243598 and 31442243607.

It is not an unprimeable number, because it can be changed into a prime (31442243683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4893573 + ... + 4899993.

It is an arithmetic number, because the mean of its divisors is an integer number (1911745914).

Almost surely, 2^31442243643 is an apocalyptic number.

31442243643 is a deficient number, since it is larger than the sum of its proper divisors (14439658293).

31442243643 is a wasteful number, since it uses less digits than its factorization.

31442243643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11915 (or 11912 counting only the distinct ones).

The product of its digits is 165888, while the sum is 36.

The spelling of 31442243643 in words is "thirty-one billion, four hundred forty-two million, two hundred forty-three thousand, six hundred forty-three".