1991536274 has 32 divisors (see below), whose sum is σ = 3731581056. Its totient is φ = 776096640.

The previous prime is 1991536223. The next prime is 1991536291. The reversal of 1991536274 is 4726351991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69467 + ... + 93854.

It is an arithmetic number, because the mean of its divisors is an integer number (116611908).

Almost surely, 2^1991536274 is an apocalyptic number.

1991536274 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1991536274 is a deficient number, since it is larger than the sum of its proper divisors (1740044782).

1991536274 is a wasteful number, since it uses less digits than its factorization.

1991536274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163410.

The product of its digits is 408240, while the sum is 47.

The square root of 1991536274 is about 44626.6318917303. The cubic root of 1991536274 is about 1258.1412658368.

The spelling of 1991536274 in words is "one billion, nine hundred ninety-one million, five hundred thirty-six thousand, two hundred seventy-four".