101506661 has 4 divisors (see below), whose sum is σ = 101595852. Its totient is φ = 101417472.

The previous prime is 101506649. The next prime is 101506663. The reversal of 101506661 is 166605101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77545636 + 23961025 = 8806^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 101506661 - 2⁶ = 101506597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 101506661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101506663) 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, 42866 + ... + 45171.

It is an arithmetic number, because the mean of its divisors is an integer number (25398963).

Almost surely, 2^101506661 is an apocalyptic number.

It is an amenable number.

101506661 is a deficient number, since it is larger than the sum of its proper divisors (89191).

101506661 is an equidigital number, since it uses as much as digits as its factorization.

101506661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89190.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 101506661 is about 10075.0514142609. The cubic root of 101506661 is about 466.4783734130.

The spelling of 101506661 in words is "one hundred one million, five hundred six thousand, six hundred sixty-one".