1155939553 has 2 divisors, whose sum is σ = 1155939554. Its totient is φ = 1155939552.

The previous prime is 1155939541. The next prime is 1155939581. The reversal of 1155939553 is 3559395511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 763582689 + 392356864 = 27633^2 + 19808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155939553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155939503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577969776 + 577969777.

It is an arithmetic number, because the mean of its divisors is an integer number (577969777).

Almost surely, 2^1155939553 is an apocalyptic number.

It is an amenable number.

1155939553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155939553 is an equidigital number, since it uses as much as digits as its factorization.

1155939553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 455625, while the sum is 46.

The square root of 1155939553 is about 33999.1110619087. Note that the first 3 decimals coincide. The cubic root of 1155939553 is about 1049.4901691189.

The spelling of 1155939553 in words is "one billion, one hundred fifty-five million, nine hundred thirty-nine thousand, five hundred fifty-three".