788017921 has 2 divisors, whose sum is σ = 788017922. Its totient is φ = 788017920.

The previous prime is 788017891. The next prime is 788017943. The reversal of 788017921 is 129710887.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 542657025 + 245360896 = 23295^2 + 15664^2 .

It is a cyclic number.

It is not a de Polignac number, because 788017921 - 2⁵ = 788017889 is a prime.

It is not a weakly prime, because it can be changed into another prime (788017981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394008960 + 394008961.

It is an arithmetic number, because the mean of its divisors is an integer number (394008961).

Almost surely, 2^788017921 is an apocalyptic number.

It is an amenable number.

788017921 is a deficient number, since it is larger than the sum of its proper divisors (1).

788017921 is an equidigital number, since it uses as much as digits as its factorization.

788017921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 788017921 is about 28071.6568980173. The cubic root of 788017921 is about 923.6597765592.

The spelling of 788017921 in words is "seven hundred eighty-eight million, seventeen thousand, nine hundred twenty-one".