987641 has 4 divisors (see below), whose sum is σ = 1014372. Its totient is φ = 960912.

The previous prime is 987631. The next prime is 987659. The reversal of 987641 is 146789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146789 = 229 ⋅641.

It can be written as a sum of positive squares in 2 ways, for example, as 354025 + 633616 = 595^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 987641 - 2¹⁰ = 986617 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (987631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13310 + ... + 13383.

It is an arithmetic number, because the mean of its divisors is an integer number (253593).

2⁹⁸⁷⁶⁴¹ is an apocalyptic number.

It is an amenable number.

987641 is a deficient number, since it is larger than the sum of its proper divisors (26731).

987641 is a wasteful number, since it uses less digits than its factorization.

987641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26730.

The product of its digits is 12096, while the sum is 35.

The square root of 987641 is about 993.8012879847. The cubic root of 987641 is about 99.5863244182.

The spelling of 987641 in words is "nine hundred eighty-seven thousand, six hundred forty-one".