31521552043 has 4 divisors (see below), whose sum is σ = 32373485920. Its totient is φ = 30669618168.

The previous prime is 31521552017. The next prime is 31521552047. The reversal of 31521552043 is 34025512513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34025512513 = 4787 ⋅7107899.

It is a cyclic number.

It is not a de Polignac number, because 31521552043 - 2⁹ = 31521551531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31521551996 and 31521552014.

It is not an unprimeable number, because it can be changed into a prime (31521552047) 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, 425966883 + ... + 425966956.

It is an arithmetic number, because the mean of its divisors is an integer number (8093371480).

Almost surely, 2^31521552043 is an apocalyptic number.

31521552043 is a deficient number, since it is larger than the sum of its proper divisors (851933877).

31521552043 is an equidigital number, since it uses as much as digits as its factorization.

31521552043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851933876.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 31521552043 in words is "thirty-one billion, five hundred twenty-one million, five hundred fifty-two thousand, forty-three".