31431301044431 has 4 divisors (see below), whose sum is σ = 31569764925912. Its totient is φ = 31292837162952.

The previous prime is 31431301044419. The next prime is 31431301044553. The reversal of 31431301044431 is 13444010313413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31431301044431 is a prime.

It is a super-2 number, since 2×31431301044431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431301041431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69231940400 + ... + 69231940853.

It is an arithmetic number, because the mean of its divisors is an integer number (7892441231478).

Almost surely, 2^{31431301044431} is an apocalyptic number.

31431301044431 is a deficient number, since it is larger than the sum of its proper divisors (138463881481).

31431301044431 is a wasteful number, since it uses less digits than its factorization.

31431301044431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138463881480.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 31431301044431 its reverse (13444010313413), we get a palindrome (44875311357844).

The spelling of 31431301044431 in words is "thirty-one trillion, four hundred thirty-one billion, three hundred one million, forty-four thousand, four hundred thirty-one".