971557 has 4 divisors (see below), whose sum is σ = 984940. Its totient is φ = 958176.

The previous prime is 971549. The next prime is 971561. The reversal of 971557 is 755179.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 198916 + 772641 = 446^2 + 879^2 .

It is a cyclic number.

It is not a de Polignac number, because 971557 - 2³ = 971549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971357) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6582 + ... + 6727.

It is an arithmetic number, because the mean of its divisors is an integer number (246235).

2⁹⁷¹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

971557 is a deficient number, since it is larger than the sum of its proper divisors (13383).

971557 is a wasteful number, since it uses less digits than its factorization.

971557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13382.

The product of its digits is 11025, while the sum is 34.

The square root of 971557 is about 985.6759102261. The cubic root of 971557 is about 99.0427662729.

The spelling of 971557 in words is "nine hundred seventy-one thousand, five hundred fifty-seven".