10020091 has 4 divisors (see below), whose sum is σ = 10045000. Its totient is φ = 9995184.

The previous prime is 10020079. The next prime is 10020097. The reversal of 10020091 is 19002001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19002001 = 43 ⋅441907.

It is a cyclic number.

It is not a de Polignac number, because 10020091 - 2⁷ = 10019963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10020097) 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, 11841 + ... + 12658.

It is an arithmetic number, because the mean of its divisors is an integer number (2511250).

Almost surely, 2^10020091 is an apocalyptic number.

10020091 is a deficient number, since it is larger than the sum of its proper divisors (24909).

10020091 is an equidigital number, since it uses as much as digits as its factorization.

10020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24908.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 10020091 is about 3165.4527322328. The cubic root of 10020091 is about 215.5876549761.

Adding to 10020091 its reverse (19002001), we get a palindrome (29022092).

The spelling of 10020091 in words is "ten million, twenty thousand, ninety-one".