988633521 has 12 divisors (see below), whose sum is σ = 1512027972. Its totient is φ = 620318976.

The previous prime is 988633507. The next prime is 988633523. The reversal of 988633521 is 125336889.

It is a happy number.

988633521 is a `hidden beast` number, since 9 + 8 + 8 + 633 + 5 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 879952896 + 108680625 = 29664^2 + 10425^2 .

It is not a de Polignac number, because 988633521 - 2⁵ = 988633489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (988633523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3230676 + ... + 3230981.

It is an arithmetic number, because the mean of its divisors is an integer number (126002331).

Almost surely, 2^988633521 is an apocalyptic number.

It is an amenable number.

988633521 is a deficient number, since it is larger than the sum of its proper divisors (523394451).

988633521 is a wasteful number, since it uses less digits than its factorization.

988633521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461680 (or 6461677 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 988633521 is about 31442.5431700427. The cubic root of 988633521 is about 996.1967271200.

The spelling of 988633521 in words is "nine hundred eighty-eight million, six hundred thirty-three thousand, five hundred twenty-one".