2101441861 has 2 divisors, whose sum is σ = 2101441862. Its totient is φ = 2101441860.

The previous prime is 2101441817. The next prime is 2101441873. The reversal of 2101441861 is 1681441012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1476941761 + 624500100 = 38431^2 + 24990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101441861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101441561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050720930 + 1050720931.

It is an arithmetic number, because the mean of its divisors is an integer number (1050720931).

Almost surely, 2^2101441861 is an apocalyptic number.

It is an amenable number.

2101441861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101441861 is an equidigital number, since it uses as much as digits as its factorization.

2101441861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 2101441861 is about 45841.4862433582. The cubic root of 2101441861 is about 1280.8721800245.

Adding to 2101441861 its reverse (1681441012), we get a palindrome (3782882873).

The spelling of 2101441861 in words is "two billion, one hundred one million, four hundred forty-one thousand, eight hundred sixty-one".