788411521 has 4 divisors (see below), whose sum is σ = 789797700. Its totient is φ = 787025344.

The previous prime is 788411501. The next prime is 788411531. The reversal of 788411521 is 125114887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125114887 = 109 ⋅1147843.

It can be written as a sum of positive squares in 2 ways, for example, as 81649296 + 706762225 = 9036^2 + 26585^2 .

It is a cyclic number.

It is not a de Polignac number, because 788411521 - 2¹¹ = 788409473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (788411501) 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, 692236 + ... + 693373.

It is an arithmetic number, because the mean of its divisors is an integer number (197449425).

Almost surely, 2^788411521 is an apocalyptic number.

It is an amenable number.

788411521 is a deficient number, since it is larger than the sum of its proper divisors (1386179).

788411521 is a wasteful number, since it uses less digits than its factorization.

788411521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386178.

The product of its digits is 17920, while the sum is 37.

The square root of 788411521 is about 28078.6666528167. Note that the first 4 decimals coincide. The cubic root of 788411521 is about 923.8135344734.

The spelling of 788411521 in words is "seven hundred eighty-eight million, four hundred eleven thousand, five hundred twenty-one".