9091991396 has 12 divisors (see below), whose sum is σ = 15919891260. Its totient is φ = 4543451040.

The previous prime is 9091991393. The next prime is 9091991431. The reversal of 9091991396 is 6931991909.

It can be written as a sum of positive squares in 2 ways, for example, as 4034790400 + 5057200996 = 63520^2 + 71114^2 .

It is not an unprimeable number, because it can be changed into a prime (9091991393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628115 + ... + 642426.

It is an arithmetic number, because the mean of its divisors is an integer number (1326657605).

Almost surely, 2^9091991396 is an apocalyptic number.

It is an amenable number.

9091991396 is a deficient number, since it is larger than the sum of its proper divisors (6827899864).

9091991396 is a wasteful number, since it uses less digits than its factorization.

9091991396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272334 (or 1272332 counting only the distinct ones).

The product of its (nonzero) digits is 1062882, while the sum is 56.

The square root of 9091991396 is about 95351.9344114214. The cubic root of 9091991396 is about 2087.1468432706.

The spelling of 9091991396 in words is "nine billion, ninety-one million, nine hundred ninety-one thousand, three hundred ninety-six".