91091002 has 4 divisors (see below), whose sum is σ = 136636506. Its totient is φ = 45545500.

The previous prime is 91090957. The next prime is 91091023. The reversal of 91091002 is 20019019.

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., 54597321 + 36493681 = 7389^2 + 6041^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22772749 + ... + 22772752.

Almost surely, 2^91091002 is an apocalyptic number.

91091002 is a deficient number, since it is larger than the sum of its proper divisors (45545504).

91091002 is a wasteful number, since it uses less digits than its factorization.

91091002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45545503.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 91091002 is about 9544.1606231245. The cubic root of 91091002 is about 449.9440292527.

The spelling of 91091002 in words is "ninety-one million, ninety-one thousand, two".