971618 has 18 divisors (see below), whose sum is σ = 1586883. Its totient is φ = 446080.

The previous prime is 971591. The next prime is 971639. The reversal of 971618 is 816179.

It can be written as a sum of positive squares in 5 ways, for example, as 237169 + 734449 = 487^2 + 857^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=697.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 971618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23678 + ... + 23718.

2⁹⁷¹⁶¹⁸ is an apocalyptic number.

971618 is a deficient number, since it is larger than the sum of its proper divisors (615265).

971618 is a wasteful number, since it uses less digits than its factorization.

971618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 60 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 971618 is about 985.7068529740. The cubic root of 971618 is about 99.0448390565.

Multiplying 971618 by its sum of digits (32), we get a square (31091776 = 5576²).

The spelling of 971618 in words is "nine hundred seventy-one thousand, six hundred eighteen".