987072491 has 4 divisors (see below), whose sum is σ = 987206400. Its totient is φ = 986938584.

The previous prime is 987072473. The next prime is 987072509. The reversal of 987072491 is 194270789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194270789 = 8539 ⋅22751.

It is an interprime number because it is at equal distance from previous prime (987072473) and next prime (987072509).

It is a cyclic number.

It is not a de Polignac number, because 987072491 - 2¹⁰ = 987071467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987072451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55211 + ... + 70868.

It is an arithmetic number, because the mean of its divisors is an integer number (246801600).

Almost surely, 2^987072491 is an apocalyptic number.

987072491 is a deficient number, since it is larger than the sum of its proper divisors (133909).

987072491 is a wasteful number, since it uses less digits than its factorization.

987072491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133908.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 987072491 is about 31417.7098306035. The cubic root of 987072491 is about 995.6721268685.

The spelling of 987072491 in words is "nine hundred eighty-seven million, seventy-two thousand, four hundred ninety-one".