30991489 has 9 divisors (see below), whose sum is σ = 32820483. Its totient is φ = 29260152.

The previous prime is 30991481. The next prime is 30991501. The reversal of 30991489 is 98419903.

The square root of 30991489 is 5567.

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

It can be written as a sum of positive squares in only one way, i.e., 29322225 + 1669264 = 5415^2 + 1292^2 .

It is not a de Polignac number, because 30991489 - 2³ = 30991481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30991481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 105627 + ... + 105919.

Almost surely, 2^30991489 is an apocalyptic number.

30991489 is the 5567-th square number.

30991489 is the 2784-th centered octagonal number.

It is an amenable number.

30991489 is a deficient number, since it is larger than the sum of its proper divisors (1828994).

30991489 is an frugal number, since it uses more digits than its factorization.

30991489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The cubic root of 30991489 is about 314.1093139081.

The spelling of 30991489 in words is "thirty million, nine hundred ninety-one thousand, four hundred eighty-nine".