101281661 has 4 divisors (see below), whose sum is σ = 109072572. Its totient is φ = 93490752.

The previous prime is 101281657. The next prime is 101281679. The reversal of 101281661 is 166182101.

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 5359225 + 95922436 = 2315^2 + 9794^2 .

It is a cyclic number.

It is not a de Polignac number, because 101281661 - 2² = 101281657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101281661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101281361) 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, 3895436 + ... + 3895461.

It is an arithmetic number, because the mean of its divisors is an integer number (27268143).

Almost surely, 2^101281661 is an apocalyptic number.

It is an amenable number.

101281661 is a deficient number, since it is larger than the sum of its proper divisors (7790911).

101281661 is an equidigital number, since it uses as much as digits as its factorization.

101281661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790910.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 101281661 is about 10063.8790235177. The cubic root of 101281661 is about 466.1334526021.

The spelling of 101281661 in words is "one hundred one million, two hundred eighty-one thousand, six hundred sixty-one".