191020072 has 16 divisors (see below), whose sum is σ = 377013600. Its totient is φ = 90483120.

The previous prime is 191020009. The next prime is 191020073. The reversal of 191020072 is 270020191.

It is not an unprimeable number, because it can be changed into a prime (191020073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628204 + ... + 628507.

It is an arithmetic number, because the mean of its divisors is an integer number (23563350).

Almost surely, 2^191020072 is an apocalyptic number.

It is an amenable number.

191020072 is a deficient number, since it is larger than the sum of its proper divisors (185993528).

191020072 is a wasteful number, since it uses less digits than its factorization.

191020072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256736 (or 1256732 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 191020072 is about 13821.0011214818. The cubic root of 191020072 is about 575.9166948068.

The spelling of 191020072 in words is "one hundred ninety-one million, twenty thousand, seventy-two".