981481587 has 16 divisors (see below), whose sum is σ = 1401196320. Its totient is φ = 608909312.

The previous prime is 981481561. The next prime is 981481601. The reversal of 981481587 is 785184189.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 981481587 - 2¹² = 981477491 is a prime.

It is a super-2 number, since 2×981481587² = 1926612211240077138, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (981482587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103578 + ... + 112655.

It is an arithmetic number, because the mean of its divisors is an integer number (87574770).

Almost surely, 2^981481587 is an apocalyptic number.

981481587 is a deficient number, since it is larger than the sum of its proper divisors (419714733).

981481587 is a wasteful number, since it uses less digits than its factorization.

981481587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216342.

The product of its digits is 645120, while the sum is 51.

The square root of 981481587 is about 31328.6065282195. The cubic root of 981481587 is about 993.7886952378.

The spelling of 981481587 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, five hundred eighty-seven".