91155506 has 8 divisors (see below), whose sum is σ = 147251244. Its totient is φ = 42071760.

The previous prime is 91155503. The next prime is 91155527. The reversal of 91155506 is 60555119.

It can be written as a sum of positive squares in 2 ways, for example, as 89965225 + 1190281 = 9485^2 + 1091^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (91155503) 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, 1752965 + ... + 1753016.

Almost surely, 2^91155506 is an apocalyptic number.

91155506 is a deficient number, since it is larger than the sum of its proper divisors (56095738).

91155506 is a wasteful number, since it uses less digits than its factorization.

91155506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505996.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 91155506 is about 9547.5392641246. The cubic root of 91155506 is about 450.0502100353.

The spelling of 91155506 in words is "ninety-one million, one hundred fifty-five thousand, five hundred six".