919191000091 has 32 divisors (see below), whose sum is σ = 1202645606400. Its totient is φ = 682172668800.

The previous prime is 919191000031. The next prime is 919191000121. The reversal of 919191000091 is 190000191919.

It is a de Polignac number, because none of the positive numbers 2^k-919191000091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (919191000031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2457211 + ... + 2806468.

It is an arithmetic number, because the mean of its divisors is an integer number (37582675200).

Almost surely, 2^919191000091 is an apocalyptic number.

919191000091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

919191000091 is a deficient number, since it is larger than the sum of its proper divisors (283454606309).

919191000091 is a wasteful number, since it uses less digits than its factorization.

919191000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263819.

The product of its (nonzero) digits is 6561, while the sum is 40.

The spelling of 919191000091 in words is "nine hundred nineteen billion, one hundred ninety-one million, ninety-one", and thus it is an aban number.