978591611 has 2 divisors, whose sum is σ = 978591612. Its totient is φ = 978591610.

The previous prime is 978591583. The next prime is 978591617. The reversal of 978591611 is 116195879.

It is a strong prime.

It is an emirp because it is prime and its reverse (116195879) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978591611 is a prime.

It is a super-2 number, since 2×978591611² = 1915283082239150642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (978591617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489295805 + 489295806.

It is an arithmetic number, because the mean of its divisors is an integer number (489295806).

Almost surely, 2^978591611 is an apocalyptic number.

978591611 is a deficient number, since it is larger than the sum of its proper divisors (1).

978591611 is an equidigital number, since it uses as much as digits as its factorization.

978591611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 47.

The square root of 978591611 is about 31282.4489290720. The cubic root of 978591611 is about 992.8123315332.

The spelling of 978591611 in words is "nine hundred seventy-eight million, five hundred ninety-one thousand, six hundred eleven".