93661 has 4 divisors (see below), whose sum is σ = 94300. Its totient is φ = 93024.

The previous prime is 93637. The next prime is 93683. The reversal of 93661 is 16639.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16639 = 7 ⋅2377.

It can be written as a sum of positive squares in 2 ways, for example, as 86436 + 7225 = 294^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 93661 - 2⁵ = 93629 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93601) 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, 25 + ... + 433.

It is an arithmetic number, because the mean of its divisors is an integer number (23575).

2⁹³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

93661 is a deficient number, since it is larger than the sum of its proper divisors (639).

93661 is a wasteful number, since it uses less digits than its factorization.

93661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638.

The product of its digits is 972, while the sum is 25.

The square root of 93661 is about 306.0408469469. The cubic root of 93661 is about 45.4136348265.

Subtracting from 93661 its sum of digits (25), we obtain a square (93636 = 306²).

The spelling of 93661 in words is "ninety-three thousand, six hundred sixty-one".