91084540 has 12 divisors (see below), whose sum is σ = 191277576. Its totient is φ = 36433808.

The previous prime is 91084519. The next prime is 91084547. The reversal of 91084540 is 4548019.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91084547) 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, 2277094 + ... + 2277133.

It is an arithmetic number, because the mean of its divisors is an integer number (15939798).

Almost surely, 2^91084540 is an apocalyptic number.

It is an amenable number.

91084540 is an abundant number, since it is smaller than the sum of its proper divisors (100193036).

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

91084540 is a wasteful number, since it uses less digits than its factorization.

91084540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554236 (or 4554234 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 91084540 is about 9543.8220855169. The cubic root of 91084540 is about 449.9333893175.

The spelling of 91084540 in words is "ninety-one million, eighty-four thousand, five hundred forty".