101604661 has 4 divisors (see below), whose sum is σ = 105108300. Its totient is φ = 98101024.

The previous prime is 101604653. The next prime is 101604689. The reversal of 101604661 is 166406101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166406101 = 1559 ⋅106739.

It can be written as a sum of positive squares in 2 ways, for example, as 24059025 + 77545636 = 4905^2 + 8806^2 .

It is a cyclic number.

It is not a de Polignac number, because 101604661 - 2³ = 101604653 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 (101604611) 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, 1751776 + ... + 1751833.

It is an arithmetic number, because the mean of its divisors is an integer number (26277075).

Almost surely, 2^101604661 is an apocalyptic number.

It is an amenable number.

101604661 is a deficient number, since it is larger than the sum of its proper divisors (3503639).

101604661 is an equidigital number, since it uses as much as digits as its factorization.

101604661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503638.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 101604661 is about 10079.9137397103. The cubic root of 101604661 is about 466.6284462462.

The spelling of 101604661 in words is "one hundred one million, six hundred four thousand, six hundred sixty-one".