101505661 has 4 divisors (see below), whose sum is σ = 101598300. Its totient is φ = 101413024.

The previous prime is 101505659. The next prime is 101505667. The reversal of 101505661 is 166505101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166505101 = 7 ⋅23786443.

It can be written as a sum of positive squares in 2 ways, for example, as 1625625 + 99880036 = 1275^2 + 9994^2 .

It is a cyclic number.

It is not a de Polignac number, because 101505661 - 2¹ = 101505659 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 (101505667) 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, 44656 + ... + 46873.

It is an arithmetic number, because the mean of its divisors is an integer number (25399575).

Almost surely, 2^101505661 is an apocalyptic number.

It is an amenable number.

101505661 is a deficient number, since it is larger than the sum of its proper divisors (92639).

101505661 is an equidigital number, since it uses as much as digits as its factorization.

101505661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92638.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 101505661 is about 10075.0017866003. The cubic root of 101505661 is about 466.4768415598.

The spelling of 101505661 in words is "one hundred one million, five hundred five thousand, six hundred sixty-one".