988667521 has 4 divisors (see below), whose sum is σ = 1046824452. Its totient is φ = 930510592.

The previous prime is 988667509. The next prime is 988667551. The reversal of 988667521 is 125766889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125766889 = 281 ⋅447569.

It can be written as a sum of positive squares in 2 ways, for example, as 899100225 + 89567296 = 29985^2 + 9464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988667521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988667551) 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, 29078440 + ... + 29078473.

It is an arithmetic number, because the mean of its divisors is an integer number (261706113).

Almost surely, 2^988667521 is an apocalyptic number.

It is an amenable number.

988667521 is a deficient number, since it is larger than the sum of its proper divisors (58156931).

988667521 is a wasteful number, since it uses less digits than its factorization.

988667521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58156930.

The product of its digits is 1451520, while the sum is 52.

The square root of 988667521 is about 31443.0838341280. The cubic root of 988667521 is about 996.2081470243.

The spelling of 988667521 in words is "nine hundred eighty-eight million, six hundred sixty-seven thousand, five hundred twenty-one".