91090946 has 4 divisors (see below), whose sum is σ = 136636422. Its totient is φ = 45545472.

The previous prime is 91090907. The next prime is 91090957. The reversal of 91090946 is 64909019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 89965225 + 1125721 = 9485^2 + 1061^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22772735 + ... + 22772738.

Almost surely, 2^91090946 is an apocalyptic number.

91090946 is a deficient number, since it is larger than the sum of its proper divisors (45545476).

91090946 is a wasteful number, since it uses less digits than its factorization.

91090946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45545475.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 91090946 is about 9544.1576893930. The cubic root of 91090946 is about 449.9439370486.

The spelling of 91090946 in words is "ninety-one million, ninety thousand, nine hundred forty-six".