958661 has 4 divisors (see below), whose sum is σ = 1045824. Its totient is φ = 871500.

The previous prime is 958637. The next prime is 958667. The reversal of 958661 is 166859.

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 958661 - 2¹⁸ = 696517 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 (958667) 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, 43565 + ... + 43586.

It is an arithmetic number, because the mean of its divisors is an integer number (261456).

2⁹⁵⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

958661 is a deficient number, since it is larger than the sum of its proper divisors (87163).

958661 is a wasteful number, since it uses less digits than its factorization.

958661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87162.

The product of its digits is 12960, while the sum is 35.

The square root of 958661 is about 979.1123531036. The cubic root of 958661 is about 98.6025969388.

The spelling of 958661 in words is "nine hundred fifty-eight thousand, six hundred sixty-one".