957661 has 4 divisors (see below), whose sum is σ = 1014012. Its totient is φ = 901312.

The previous prime is 957659. The next prime is 957701. The reversal of 957661 is 166759.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166759 = 37 ⋅4507.

It can be written as a sum of positive squares in 2 ways, for example, as 308025 + 649636 = 555^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 957661 - 2¹ = 957659 is a prime.

It is a super-2 number, since 2×957661² = 1834229181842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (957601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28150 + ... + 28183.

It is an arithmetic number, because the mean of its divisors is an integer number (253503).

2⁹⁵⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

957661 is a deficient number, since it is larger than the sum of its proper divisors (56351).

957661 is a wasteful number, since it uses less digits than its factorization.

957661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56350.

The product of its digits is 11340, while the sum is 34.

The square root of 957661 is about 978.6015532381. The cubic root of 957661 is about 98.5683001778.

The spelling of 957661 in words is "nine hundred fifty-seven thousand, six hundred sixty-one".