1101220515541 has 2 divisors, whose sum is σ = 1101220515542. Its totient is φ = 1101220515540.

The previous prime is 1101220515523. The next prime is 1101220515553. The reversal of 1101220515541 is 1455150221011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650852016516 + 450368499025 = 806754^2 + 671095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101220515541 - 2⁷ = 1101220515413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101220545541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550610257770 + 550610257771.

It is an arithmetic number, because the mean of its divisors is an integer number (550610257771).

Almost surely, 2^{1101220515541} is an apocalyptic number.

It is an amenable number.

1101220515541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101220515541 is an equidigital number, since it uses as much as digits as its factorization.

1101220515541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000, while the sum is 28.

Adding to 1101220515541 its reverse (1455150221011), we get a palindrome (2556370736552).

The spelling of 1101220515541 in words is "one trillion, one hundred one billion, two hundred twenty million, five hundred fifteen thousand, five hundred forty-one".