987577949 has 2 divisors, whose sum is σ = 987577950. Its totient is φ = 987577948.

The previous prime is 987577873. The next prime is 987577951. The reversal of 987577949 is 949775789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665124100 + 322453849 = 25790^2 + 17957^2 .

It is an emirp because it is prime and its reverse (949775789) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987577949 is a prime.

Together with 987577951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987577849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493788974 + 493788975.

It is an arithmetic number, because the mean of its divisors is an integer number (493788975).

Almost surely, 2^987577949 is an apocalyptic number.

It is an amenable number.

987577949 is a deficient number, since it is larger than the sum of its proper divisors (1).

987577949 is an equidigital number, since it uses as much as digits as its factorization.

987577949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40007520, while the sum is 65.

The square root of 987577949 is about 31425.7529583620. The cubic root of 987577949 is about 995.8420517614.

The spelling of 987577949 in words is "nine hundred eighty-seven million, five hundred seventy-seven thousand, nine hundred forty-nine".