389088991 has 2 divisors, whose sum is σ = 389088992. Its totient is φ = 389088990.

The previous prime is 389088949. The next prime is 389089009. The reversal of 389088991 is 199880983.

It is a strong prime.

It is an emirp because it is prime and its reverse (199880983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389088991 - 2¹⁵ = 389056223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389088901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194544495 + 194544496.

It is an arithmetic number, because the mean of its divisors is an integer number (194544496).

Almost surely, 2^389088991 is an apocalyptic number.

389088991 is a deficient number, since it is larger than the sum of its proper divisors (1).

389088991 is an equidigital number, since it uses as much as digits as its factorization.

389088991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 389088991 is about 19725.3388057088. The cubic root of 389088991 is about 730.0450281852.

The spelling of 389088991 in words is "three hundred eighty-nine million, eighty-eight thousand, nine hundred ninety-one".