320618887 has 2 divisors, whose sum is σ = 320618888. Its totient is φ = 320618886.

The previous prime is 320618869. The next prime is 320618891. The reversal of 320618887 is 788816023.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320618887 is a prime.

It is a super-2 number, since 2×320618887² = 205592941402237538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320618807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160309443 + 160309444.

It is an arithmetic number, because the mean of its divisors is an integer number (160309444).

Almost surely, 2^320618887 is an apocalyptic number.

320618887 is a deficient number, since it is larger than the sum of its proper divisors (1).

320618887 is an equidigital number, since it uses as much as digits as its factorization.

320618887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 320618887 is about 17905.8338817269. The cubic root of 320618887 is about 684.4310454911.

The spelling of 320618887 in words is "three hundred twenty million, six hundred eighteen thousand, eight hundred eighty-seven".