91019412 has 36 divisors (see below), whose sum is σ = 250994016. Its totient is φ = 27581520.

The previous prime is 91019389. The next prime is 91019413. The reversal of 91019412 is 21491019.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91019413) 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 11 ways as a sum of consecutive naturals, for example, 114528 + ... + 115319.

It is an arithmetic number, because the mean of its divisors is an integer number (6972056).

Almost surely, 2^91019412 is an apocalyptic number.

It is an amenable number.

91019412 is an abundant number, since it is smaller than the sum of its proper divisors (159974604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91019412 is a wasteful number, since it uses less digits than its factorization.

91019412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229868 (or 229863 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 91019412 is about 9540.4094251767. The cubic root of 91019412 is about 449.8261254182.

The spelling of 91019412 in words is "ninety-one million, nineteen thousand, four hundred twelve".