91939066 has 8 divisors (see below), whose sum is σ = 138045204. Its totient is φ = 45924000.

The previous prime is 91939061. The next prime is 91939079. The reversal of 91939066 is 66093919.

It can be written as a sum of positive squares in 2 ways, for example, as 80910025 + 11029041 = 8995^2 + 3321^2 .

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 (91939061) 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, 20185 + ... + 24316.

Almost surely, 2^91939066 is an apocalyptic number.

91939066 is a deficient number, since it is larger than the sum of its proper divisors (46106138).

91939066 is a wasteful number, since it uses less digits than its factorization.

91939066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45536.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 91939066 is about 9588.4861161708. The cubic root of 91939066 is about 451.3360556457.

The spelling of 91939066 in words is "ninety-one million, nine hundred thirty-nine thousand, sixty-six".