978321511 has 2 divisors, whose sum is σ = 978321512. Its totient is φ = 978321510.

The previous prime is 978321481. The next prime is 978321517. The reversal of 978321511 is 115123879.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978321511 is a prime.

It is a super-2 number, since 2×978321511² = 1914225957770646242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978321517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489160755 + 489160756.

It is an arithmetic number, because the mean of its divisors is an integer number (489160756).

Almost surely, 2^978321511 is an apocalyptic number.

978321511 is a deficient number, since it is larger than the sum of its proper divisors (1).

978321511 is an equidigital number, since it uses as much as digits as its factorization.

978321511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 978321511 is about 31278.1315138868. The cubic root of 978321511 is about 992.7209814463.

The spelling of 978321511 in words is "nine hundred seventy-eight million, three hundred twenty-one thousand, five hundred eleven".