7191991490 has 16 divisors (see below), whose sum is σ = 12978870840. Its totient is φ = 2869399680.

The previous prime is 7191991489. The next prime is 7191991567. The reversal of 7191991490 is 941991917.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3398540209 + 3793451281 = 58297^2 + 61591^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920531 + ... + 928310.

Almost surely, 2^7191991490 is an apocalyptic number.

7191991490 is a deficient number, since it is larger than the sum of its proper divisors (5786879350).

7191991490 is a wasteful number, since it uses less digits than its factorization.

7191991490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849237.

The product of its (nonzero) digits is 183708, while the sum is 50.

The square root of 7191991490 is about 84805.6100149041. The cubic root of 7191991490 is about 1930.2625655110.

The spelling of 7191991490 in words is "seven billion, one hundred ninety-one million, nine hundred ninety-one thousand, four hundred ninety".