978650987 has 2 divisors, whose sum is σ = 978650988. Its totient is φ = 978650986.

The previous prime is 978650983. The next prime is 978651001. The reversal of 978650987 is 789056879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 978650987 - 2² = 978650983 is a prime.

It is not a weakly prime, because it can be changed into another prime (978650983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489325493 + 489325494.

It is an arithmetic number, because the mean of its divisors is an integer number (489325494).

Almost surely, 2^978650987 is an apocalyptic number.

978650987 is a deficient number, since it is larger than the sum of its proper divisors (1).

978650987 is an equidigital number, since it uses as much as digits as its factorization.

978650987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The square root of 978650987 is about 31283.3979452361. The cubic root of 978650987 is about 992.8324107409.

The spelling of 978650987 in words is "nine hundred seventy-eight million, six hundred fifty thousand, nine hundred eighty-seven".