91000004 has 12 divisors (see below), whose sum is σ = 164387328. Its totient is φ = 44032200.

The previous prime is 90999989. The next prime is 91000009. The reversal of 91000004 is 40000019.

It is not an unprimeable number, because it can be changed into a prime (91000009) 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, 366812 + ... + 367059.

It is an arithmetic number, because the mean of its divisors is an integer number (13698944).

Almost surely, 2^91000004 is an apocalyptic number.

It is an amenable number.

91000004 is a deficient number, since it is larger than the sum of its proper divisors (73387324).

91000004 is a wasteful number, since it uses less digits than its factorization.

91000004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733906 (or 733904 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 91000004 is about 9539.3922238264. The cubic root of 91000004 is about 449.7941511179.

The spelling of 91000004 in words is "ninety-one million, four", and thus it is an aban number.