118989391 has 2 divisors, whose sum is σ = 118989392. Its totient is φ = 118989390.

The previous prime is 118989389. The next prime is 118989401. The reversal of 118989391 is 193989811.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 118989391 - 2¹ = 118989389 is a prime.

Together with 118989389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118989491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59494695 + 59494696.

It is an arithmetic number, because the mean of its divisors is an integer number (59494696).

Almost surely, 2^118989391 is an apocalyptic number.

118989391 is a deficient number, since it is larger than the sum of its proper divisors (1).

118989391 is an equidigital number, since it uses as much as digits as its factorization.

118989391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 49.

The square root of 118989391 is about 10908.2258410797. The cubic root of 118989391 is about 491.8538561133.

The spelling of 118989391 in words is "one hundred eighteen million, nine hundred eighty-nine thousand, three hundred ninety-one".