787481233521 has 4 divisors (see below), whose sum is σ = 1049974978032. Its totient is φ = 524987489012.

The previous prime is 787481233519. The next prime is 787481233531. The reversal of 787481233521 is 125332184787.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125332184787 = 3 ⋅41777394929.

It is a cyclic number.

It is not a de Polignac number, because 787481233521 - 2¹ = 787481233519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (787481233531) 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, 131246872251 + ... + 131246872256.

It is an arithmetic number, because the mean of its divisors is an integer number (262493744508).

Almost surely, 2^787481233521 is an apocalyptic number.

It is an amenable number.

787481233521 is a deficient number, since it is larger than the sum of its proper divisors (262493744511).

787481233521 is a wasteful number, since it uses less digits than its factorization.

787481233521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262493744510.

The product of its digits is 2257920, while the sum is 51.

The spelling of 787481233521 in words is "seven hundred eighty-seven billion, four hundred eighty-one million, two hundred thirty-three thousand, five hundred twenty-one".