987517391 has 8 divisors (see below), whose sum is σ = 1130136864. Its totient is φ = 845284320.

The previous prime is 987517379. The next prime is 987517409. The reversal of 987517391 is 193715789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987517391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987517331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91100 + ... + 101361.

It is an arithmetic number, because the mean of its divisors is an integer number (141267108).

Almost surely, 2^987517391 is an apocalyptic number.

987517391 is a deficient number, since it is larger than the sum of its proper divisors (142619473).

987517391 is a wasteful number, since it uses less digits than its factorization.

987517391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193201.

The product of its digits is 476280, while the sum is 50.

The square root of 987517391 is about 31424.7894344576. The cubic root of 987517391 is about 995.8216964278.

The spelling of 987517391 in words is "nine hundred eighty-seven million, five hundred seventeen thousand, three hundred ninety-one".