987790949 has 2 divisors, whose sum is σ = 987790950. Its totient is φ = 987790948.

The previous prime is 987790927. The next prime is 987790987. The reversal of 987790949 is 949097789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 962860900 + 24930049 = 31030^2 + 4993^2 .

It is an emirp because it is prime and its reverse (949097789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987790949 - 2²⁴ = 971013733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 987790891 and 987790900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987790549) 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, 493895474 + 493895475.

It is an arithmetic number, because the mean of its divisors is an integer number (493895475).

Almost surely, 2^987790949 is an apocalyptic number.

It is an amenable number.

987790949 is a deficient number, since it is larger than the sum of its proper divisors (1).

987790949 is an equidigital number, since it uses as much as digits as its factorization.

987790949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 62.

The square root of 987790949 is about 31429.1417159298. The cubic root of 987790949 is about 995.9136407465.

The spelling of 987790949 in words is "nine hundred eighty-seven million, seven hundred ninety thousand, nine hundred forty-nine".