289020091 has 4 divisors (see below), whose sum is σ = 289059184. Its totient is φ = 288981000.

The previous prime is 289020049. The next prime is 289020107. The reversal of 289020091 is 190020982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190020982 = 2 ⋅95010491.

It is a cyclic number.

It is not a de Polignac number, because 289020091 - 2¹⁷ = 288889019 is a prime.

It is a super-2 number, since 2×289020091² = 167065226003296562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289020041) 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, 4695 + ... + 24496.

It is an arithmetic number, because the mean of its divisors is an integer number (72264796).

Almost surely, 2^289020091 is an apocalyptic number.

289020091 is a deficient number, since it is larger than the sum of its proper divisors (39093).

289020091 is an equidigital number, since it uses as much as digits as its factorization.

289020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39092.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 289020091 is about 17000.5909014952. The cubic root of 289020091 is about 661.1642223011.

The spelling of 289020091 in words is "two hundred eighty-nine million, twenty thousand, ninety-one".