31521455404243 has 16 divisors (see below), whose sum is σ = 36263644581376. Its totient is φ = 26839052697600.

The previous prime is 31521455404199. The next prime is 31521455404261. The reversal of 31521455404243 is 34240455412513.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31521455404243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31521455404243.

It is not an unprimeable number, because it can be changed into a prime (31521455407243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84239080 + ... + 84612442.

It is an arithmetic number, because the mean of its divisors is an integer number (2266477786336).

Almost surely, 2^{31521455404243} is an apocalyptic number.

31521455404243 is a deficient number, since it is larger than the sum of its proper divisors (4742189177133).

31521455404243 is a wasteful number, since it uses less digits than its factorization.

31521455404243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453394.

The product of its (nonzero) digits is 1152000, while the sum is 43.

The spelling of 31521455404243 in words is "thirty-one trillion, five hundred twenty-one billion, four hundred fifty-five million, four hundred four thousand, two hundred forty-three".