971645 has 8 divisors (see below), whose sum is σ = 1206360. Its totient is φ = 750400.

The previous prime is 971639. The next prime is 971651. The reversal of 971645 is 546179.

Added to its reverse (546179) it gives a square (1517824 = 1232²).

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (971639) and next prime (971651).

It can be written as a sum of positive squares in 4 ways, for example, as 76729 + 894916 = 277^2 + 946^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 971645 - 2⁸ = 971389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3206 + ... + 3495.

It is an arithmetic number, because the mean of its divisors is an integer number (150795).

2⁹⁷¹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

971645 is a deficient number, since it is larger than the sum of its proper divisors (234715).

971645 is a wasteful number, since it uses less digits than its factorization.

971645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6735.

The product of its digits is 7560, while the sum is 32.

The square root of 971645 is about 985.7205486343. The cubic root of 971645 is about 99.0457564904.

Adding to 971645 its reverse (546179), we get a square (1517824 = 1232²).

The spelling of 971645 in words is "nine hundred seventy-one thousand, six hundred forty-five".