987434581 has 4 divisors (see below), whose sum is σ = 1128496672. Its totient is φ = 846372492.

The previous prime is 987434563. The next prime is 987434593. The reversal of 987434581 is 185434789.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185434789 = 5477 ⋅33857.

It is not a de Polignac number, because 987434581 - 2⁵ = 987434549 is a prime.

It is a super-2 number, since 2×987434581² = 1950054103509291122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a pancake number, because a pancake can be divided into 987434581 parts by 44439 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987434531) 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 in 3 ways as a sum of consecutive naturals, for example, 70531035 + ... + 70531048.

It is an arithmetic number, because the mean of its divisors is an integer number (282124168).

Almost surely, 2^987434581 is an apocalyptic number.

It is an amenable number.

987434581 is a deficient number, since it is larger than the sum of its proper divisors (141062091).

987434581 is a wasteful number, since it uses less digits than its factorization.

987434581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141062090.

The product of its digits is 967680, while the sum is 49.

The square root of 987434581 is about 31423.4718164623. The cubic root of 987434581 is about 995.7938601924.

The spelling of 987434581 in words is "nine hundred eighty-seven million, four hundred thirty-four thousand, five hundred eighty-one".