91020044 has 6 divisors (see below), whose sum is σ = 159285084. Its totient is φ = 45510020.

The previous prime is 91020029. The next prime is 91020049. The reversal of 91020044 is 44002019.

It is a junction number, because it is equal to n+sod(n) for n = 91019998 and 91020025.

It is not an unprimeable number, because it can be changed into a prime (91020049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11377502 + ... + 11377509.

It is an arithmetic number, because the mean of its divisors is an integer number (26547514).

Almost surely, 2^91020044 is an apocalyptic number.

It is an amenable number.

91020044 is a deficient number, since it is larger than the sum of its proper divisors (68265040).

91020044 is a wasteful number, since it uses less digits than its factorization.

91020044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22755015 (or 22755013 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 91020044 is about 9540.4425473874. The cubic root of 91020044 is about 449.8271665494.

The spelling of 91020044 in words is "ninety-one million, twenty thousand, forty-four".