31980109823 has 4 divisors (see below), whose sum is σ = 32064490440. Its totient is φ = 31895729208.

The previous prime is 31980109813. The next prime is 31980109829. The reversal of 31980109823 is 32890108913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32890108913 = 17 ⋅1934712289.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31980109823 is a prime.

It is a super-2 number, since 2×31980109823² (a number of 22 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 (31980109829) 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, 42189740 + ... + 42190497.

It is an arithmetic number, because the mean of its divisors is an integer number (8016122610).

Almost surely, 2^31980109823 is an apocalyptic number.

31980109823 is a deficient number, since it is larger than the sum of its proper divisors (84380617).

31980109823 is an equidigital number, since it uses as much as digits as its factorization.

31980109823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84380616.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 31980109823 in words is "thirty-one billion, nine hundred eighty million, one hundred nine thousand, eight hundred twenty-three".