920019091 has 4 divisors (see below), whose sum is σ = 920640952. Its totient is φ = 919397232.

The previous prime is 920019053. The next prime is 920019109. The reversal of 920019091 is 190910029.

920019091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190910029 = 1823 ⋅104723.

It is a cyclic number.

It is not a de Polignac number, because 920019091 - 2¹³ = 920010899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920019011) 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, 308706 + ... + 311671.

It is an arithmetic number, because the mean of its divisors is an integer number (230160238).

Almost surely, 2^920019091 is an apocalyptic number.

920019091 is a deficient number, since it is larger than the sum of its proper divisors (621861).

920019091 is a wasteful number, since it uses less digits than its factorization.

920019091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621860.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 920019091 is about 30331.8164803890. The cubic root of 920019091 is about 972.5955535974.

The spelling of 920019091 in words is "nine hundred twenty million, nineteen thousand, ninety-one".