308906089 has 4 divisors (see below), whose sum is σ = 308952900. Its totient is φ = 308859280.

The previous prime is 308906069. The next prime is 308906107. The reversal of 308906089 is 980609803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 980609803 = 73 ⋅13433011.

It can be written as a sum of positive squares in 2 ways, for example, as 215590489 + 93315600 = 14683^2 + 9660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-308906089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (308906069) 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, 11482 + ... + 27379.

It is an arithmetic number, because the mean of its divisors is an integer number (77238225).

Almost surely, 2^308906089 is an apocalyptic number.

It is an amenable number.

308906089 is a deficient number, since it is larger than the sum of its proper divisors (46811).

308906089 is an equidigital number, since it uses as much as digits as its factorization.

308906089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46810.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 308906089 is about 17575.7244231923. The cubic root of 308906089 is about 675.9929339095.

The spelling of 308906089 in words is "three hundred eight million, nine hundred six thousand, eighty-nine".