101559661 has 4 divisors (see below), whose sum is σ = 116068192. Its totient is φ = 87051132.

The previous prime is 101559637. The next prime is 101559671. The reversal of 101559661 is 166955101.

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 not a de Polignac number, because 101559661 - 2⁵ = 101559629 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 (101559611) 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, 7254255 + ... + 7254268.

It is an arithmetic number, because the mean of its divisors is an integer number (29017048).

Almost surely, 2^101559661 is an apocalyptic number.

It is an amenable number.

101559661 is a deficient number, since it is larger than the sum of its proper divisors (14508531).

101559661 is an equidigital number, since it uses as much as digits as its factorization.

101559661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14508530.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 101559661 is about 10077.6813305442. The cubic root of 101559661 is about 466.5595472389.

The spelling of 101559661 in words is "one hundred one million, five hundred fifty-nine thousand, six hundred sixty-one".