30991490 has 32 divisors (see below), whose sum is σ = 57561840. Its totient is φ = 12006400.

The previous prime is 30991481. The next prime is 30991501. The reversal of 30991490 is 9419903.

It is a Cunningham number, because it is equal to 5567²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 2036329 + 28955161 = 1427^2 + 5381^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30991490.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 110150 + ... + 110430.

Almost surely, 2^30991490 is an apocalyptic number.

30991490 is a deficient number, since it is larger than the sum of its proper divisors (26570350).

30991490 is a wasteful number, since it uses less digits than its factorization.

30991490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 30991490 is about 5567.0000898150. Note that the first 4 decimals coincide. The cubic root of 30991490 is about 314.1093172865.

The spelling of 30991490 in words is "thirty million, nine hundred ninety-one thousand, four hundred ninety".