988740521 has 4 divisors (see below), whose sum is σ = 1004949444. Its totient is φ = 972531600.

The previous prime is 988740517. The next prime is 988740523. The reversal of 988740521 is 125047889.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61842496 + 926898025 = 7864^2 + 30445^2 .

It is a cyclic number.

It is not a de Polignac number, because 988740521 - 2² = 988740517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988740523) 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, 8104370 + ... + 8104491.

It is an arithmetic number, because the mean of its divisors is an integer number (251237361).

Almost surely, 2^988740521 is an apocalyptic number.

It is an amenable number.

988740521 is a deficient number, since it is larger than the sum of its proper divisors (16208923).

988740521 is a wasteful number, since it uses less digits than its factorization.

988740521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16208922.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 988740521 is about 31444.2446403153. The cubic root of 988740521 is about 996.2326653460.

The spelling of 988740521 in words is "nine hundred eighty-eight million, seven hundred forty thousand, five hundred twenty-one".