981505 has 16 divisors (see below), whose sum is σ = 1393920. Its totient is φ = 649152.

The previous prime is 981493. The next prime is 981517. The reversal of 981505 is 505189.

981505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (981493) and next prime (981517).

It is not a de Polignac number, because 981505 - 2⁵ = 981473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532 + ... + 1498.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2⁹⁸¹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

981505 is a deficient number, since it is larger than the sum of its proper divisors (412415).

981505 is a wasteful number, since it uses less digits than its factorization.

981505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 981505 is about 990.7093418354. The cubic root of 981505 is about 99.3796597369.

The spelling of 981505 in words is "nine hundred eighty-one thousand, five hundred five".