978511 has 2 divisors, whose sum is σ = 978512. Its totient is φ = 978510.

The previous prime is 978491. The next prime is 978521. The reversal of 978511 is 115879.

It is a strong prime.

It is an emirp because it is prime and its reverse (115879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978511 - 2⁵ = 978479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489255 + 489256.

It is an arithmetic number, because the mean of its divisors is an integer number (489256).

2⁹⁷⁸⁵¹¹ is an apocalyptic number.

978511 is a deficient number, since it is larger than the sum of its proper divisors (1).

978511 is an equidigital number, since it uses as much as digits as its factorization.

978511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 31.

The square root of 978511 is about 989.1971492074. The cubic root of 978511 is about 99.2785069976.

The spelling of 978511 in words is "nine hundred seventy-eight thousand, five hundred eleven".