289193621 has 2 divisors, whose sum is σ = 289193622. Its totient is φ = 289193620.

The previous prime is 289193573. The next prime is 289193627. The reversal of 289193621 is 126391982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194909521 + 94284100 = 13961^2 + 9710^2 .

It is a cyclic number.

It is not a de Polignac number, because 289193621 - 2⁶ = 289193557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289193627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144596810 + 144596811.

It is an arithmetic number, because the mean of its divisors is an integer number (144596811).

Almost surely, 2^289193621 is an apocalyptic number.

It is an amenable number.

289193621 is a deficient number, since it is larger than the sum of its proper divisors (1).

289193621 is an equidigital number, since it uses as much as digits as its factorization.

289193621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 289193621 is about 17005.6937817897. The cubic root of 289193621 is about 661.2965186094.

The spelling of 289193621 in words is "two hundred eighty-nine million, one hundred ninety-three thousand, six hundred twenty-one".