523631920181 has 4 divisors (see below), whose sum is σ = 523642152864. Its totient is φ = 523621687500.

The previous prime is 523631920171. The next prime is 523631920213. The reversal of 523631920181 is 181029136325.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 523631920181 - 2¹⁴ = 523631903797 is a prime.

It is a super-2 number, since 2×523631920181² (a number of 24 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 (523631920121) 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, 5039195 + ... + 5142056.

It is an arithmetic number, because the mean of its divisors is an integer number (130910538216).

Almost surely, 2^523631920181 is an apocalyptic number.

It is an amenable number.

523631920181 is a deficient number, since it is larger than the sum of its proper divisors (10232683).

523631920181 is a wasteful number, since it uses less digits than its factorization.

523631920181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232682.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 523631920181 in words is "five hundred twenty-three billion, six hundred thirty-one million, nine hundred twenty thousand, one hundred eighty-one".