91020058 has 4 divisors (see below), whose sum is σ = 136530090. Its totient is φ = 45510028.

The previous prime is 91020053. The next prime is 91020071. The reversal of 91020058 is 85002019.

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., 84327489 + 6692569 = 9183^2 + 2587^2 .

It is not an unprimeable number, because it can be changed into a prime (91020053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22755013 + ... + 22755016.

Almost surely, 2^91020058 is an apocalyptic number.

91020058 is a deficient number, since it is larger than the sum of its proper divisors (45510032).

91020058 is a wasteful number, since it uses less digits than its factorization.

91020058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45510031.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 91020058 is about 9540.4432811060. The cubic root of 91020058 is about 449.8271896124.

The spelling of 91020058 in words is "ninety-one million, twenty thousand, fifty-eight".