987790451 has 2 divisors, whose sum is σ = 987790452. Its totient is φ = 987790450.

The previous prime is 987790421. The next prime is 987790477. The reversal of 987790451 is 154097789.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 987790451 - 2¹⁸ = 987528307 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 987790451.

It is not a weakly prime, because it can be changed into another prime (987790421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493895225 + 493895226.

It is an arithmetic number, because the mean of its divisors is an integer number (493895226).

Almost surely, 2^987790451 is an apocalyptic number.

987790451 is a deficient number, since it is larger than the sum of its proper divisors (1).

987790451 is an equidigital number, since it uses as much as digits as its factorization.

987790451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 987790451 is about 31429.1337933453. The cubic root of 987790451 is about 995.9134733815.

The spelling of 987790451 in words is "nine hundred eighty-seven million, seven hundred ninety thousand, four hundred fifty-one".