2381521795523 has 16 divisors (see below), whose sum is σ = 2595777438240. Its totient is φ = 2171706829824.

The previous prime is 2381521795501. The next prime is 2381521795577. The reversal of 2381521795523 is 3255971251832.

It is a happy number.

It is a Cunningham number, because it is equal to 1543218²-1.

It is not a de Polignac number, because 2381521795523 - 2¹⁰ = 2381521794499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2381521794523) 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, 20002493 + ... + 20121201.

It is an arithmetic number, because the mean of its divisors is an integer number (162236089890).

Almost surely, 2^{2381521795523} is an apocalyptic number.

2381521795523 is a deficient number, since it is larger than the sum of its proper divisors (214255642717).

2381521795523 is a wasteful number, since it uses less digits than its factorization.

2381521795523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137398.

The product of its digits is 4536000, while the sum is 53.

The spelling of 2381521795523 in words is "two trillion, three hundred eighty-one billion, five hundred twenty-one million, seven hundred ninety-five thousand, five hundred twenty-three".