1108157521 has 3 divisors (see below), whose sum is σ = 1108190811. Its totient is φ = 1108124232.

The previous prime is 1108157509. The next prime is 1108157579. The reversal of 1108157521 is 1257518011.

The square root of 1108157521 is 33289.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 34939921 + 1073217600 = 5911^2 + 32760^2 .

It is not a de Polignac number, because 1108157521 - 2²¹ = 1106060369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1108157581) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 16645 + ... + 49933.

It is an arithmetic number, because the mean of its divisors is an integer number (369396937).

Almost surely, 2^1108157521 is an apocalyptic number.

1108157521 is the 33289-th square number.

1108157521 is the 16645-th centered octagonal number.

It is an amenable number.

1108157521 is a deficient number, since it is larger than the sum of its proper divisors (33290).

1108157521 is an frugal number, since it uses more digits than its factorization.

1108157521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66578 (or 33289 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 31.

The cubic root of 1108157521 is about 1034.8256051316.

It can be divided in two parts, 110815 and 7521, that added together give a square (118336 = 344²).

The spelling of 1108157521 in words is "one billion, one hundred eight million, one hundred fifty-seven thousand, five hundred twenty-one".