978317399 has 2 divisors, whose sum is σ = 978317400. Its totient is φ = 978317398.

The previous prime is 978317393. The next prime is 978317413. The reversal of 978317399 is 993713879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 978317399 - 2¹⁶ = 978251863 is a prime.

It is a super-2 number, since 2×978317399² = 1914209866372250402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978317393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489158699 + 489158700.

It is an arithmetic number, because the mean of its divisors is an integer number (489158700).

Almost surely, 2^978317399 is an apocalyptic number.

978317399 is a deficient number, since it is larger than the sum of its proper divisors (1).

978317399 is an equidigital number, since it uses as much as digits as its factorization.

978317399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2571912, while the sum is 56.

The square root of 978317399 is about 31278.0657809910. The cubic root of 978317399 is about 992.7195906035.

The spelling of 978317399 in words is "nine hundred seventy-eight million, three hundred seventeen thousand, three hundred ninety-nine".