987517379 has 2 divisors, whose sum is σ = 987517380. Its totient is φ = 987517378.

The previous prime is 987517339. The next prime is 987517409. The reversal of 987517379 is 973715789.

It is a strong prime.

It is an emirp because it is prime and its reverse (973715789) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987517379 is a prime.

It is not a weakly prime, because it can be changed into another prime (987517339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493758689 + 493758690.

It is an arithmetic number, because the mean of its divisors is an integer number (493758690).

Almost surely, 2^987517379 is an apocalyptic number.

987517379 is a deficient number, since it is larger than the sum of its proper divisors (1).

987517379 is an equidigital number, since it uses as much as digits as its factorization.

987517379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 56.

The square root of 987517379 is about 31424.7892435256. The cubic root of 987517379 is about 995.8216923942.

The spelling of 987517379 in words is "nine hundred eighty-seven million, five hundred seventeen thousand, three hundred seventy-nine".