31887223903 has 4 divisors (see below), whose sum is σ = 31893219688. Its totient is φ = 31881228120.

The previous prime is 31887223891. The next prime is 31887223919. The reversal of 31887223903 is 30932278813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30932278813 = 199 ⋅155438587.

It is a cyclic number.

It is not a de Polignac number, because 31887223903 - 2⁵ = 31887223871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31887223003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2989908 + ... + 3000553.

It is an arithmetic number, because the mean of its divisors is an integer number (7973304922).

Almost surely, 2^31887223903 is an apocalyptic number.

31887223903 is a deficient number, since it is larger than the sum of its proper divisors (5995785).

31887223903 is an equidigital number, since it uses as much as digits as its factorization.

31887223903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5995784.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 31887223903 in words is "thirty-one billion, eight hundred eighty-seven million, two hundred twenty-three thousand, nine hundred three".