1155939541 has 2 divisors, whose sum is σ = 1155939542. Its totient is φ = 1155939540.

The previous prime is 1155939539. The next prime is 1155939553. The reversal of 1155939541 is 1459395511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722050641 + 433888900 = 26871^2 + 20830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155939541 - 2¹ = 1155939539 is a prime.

Together with 1155939539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155939581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577969770 + 577969771.

It is an arithmetic number, because the mean of its divisors is an integer number (577969771).

Almost surely, 2^1155939541 is an apocalyptic number.

It is an amenable number.

1155939541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155939541 is an equidigital number, since it uses as much as digits as its factorization.

1155939541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 43.

The square root of 1155939541 is about 33999.1108854335. The cubic root of 1155939541 is about 1049.4901654873.

The spelling of 1155939541 in words is "one billion, one hundred fifty-five million, nine hundred thirty-nine thousand, five hundred forty-one".