975721 has 4 divisors (see below), whose sum is σ = 990352. Its totient is φ = 961092.

The previous prime is 975701. The next prime is 975731. The reversal of 975721 is 127579.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 975721 - 2¹³ = 967529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (975701) 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, 7215 + ... + 7348.

It is an arithmetic number, because the mean of its divisors is an integer number (247588).

2⁹⁷⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

975721 is a deficient number, since it is larger than the sum of its proper divisors (14631).

975721 is a wasteful number, since it uses less digits than its factorization.

975721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14630.

The product of its digits is 4410, while the sum is 31.

The square root of 975721 is about 987.7859079780. The cubic root of 975721 is about 99.1840605351.

The spelling of 975721 in words is "nine hundred seventy-five thousand, seven hundred twenty-one".