31440672431 has 8 divisors (see below), whose sum is σ = 36028533024. Its totient is φ = 26876895840.

The previous prime is 31440672359. The next prime is 31440672433. The reversal of 31440672431 is 13427604413.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31440672431 is a prime.

It is a super-2 number, since 2×31440672431² (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 = 31440672391 and 31440672400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440672433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6018200 + ... + 6023421.

It is an arithmetic number, because the mean of its divisors is an integer number (4503566628).

Almost surely, 2^31440672431 is an apocalyptic number.

31440672431 is a deficient number, since it is larger than the sum of its proper divisors (4587860593).

31440672431 is a wasteful number, since it uses less digits than its factorization.

31440672431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12042001.

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 31440672431 in words is "thirty-one billion, four hundred forty million, six hundred seventy-two thousand, four hundred thirty-one".