31373220023 has 4 divisors (see below), whose sum is σ = 31377274368. Its totient is φ = 31369165680.

The previous prime is 31373220013. The next prime is 31373220077. The reversal of 31373220023 is 32002237313.

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

It is a cyclic number.

It is not a de Polignac number, because 31373220023 - 2²⁴ = 31356442807 is a prime.

It is a super-2 number, since 2×31373220023² (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 = 31373219974 and 31373220001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31373220013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015543 + ... + 2031048.

It is an arithmetic number, because the mean of its divisors is an integer number (7844318592).

Almost surely, 2^31373220023 is an apocalyptic number.

31373220023 is a deficient number, since it is larger than the sum of its proper divisors (4054345).

31373220023 is an equidigital number, since it uses as much as digits as its factorization.

31373220023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4054344.

The product of its (nonzero) digits is 4536, while the sum is 26.

Adding to 31373220023 its reverse (32002237313), we get a palindrome (63375457336).

The spelling of 31373220023 in words is "thirty-one billion, three hundred seventy-three million, two hundred twenty thousand, twenty-three".