1555135573 has 2 divisors, whose sum is σ = 1555135574. Its totient is φ = 1555135572.

The previous prime is 1555135471. The next prime is 1555135609. The reversal of 1555135573 is 3755315551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1513054404 + 42081169 = 38898^2 + 6487^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555135573 - 2¹³ = 1555127381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555135073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777567786 + 777567787.

It is an arithmetic number, because the mean of its divisors is an integer number (777567787).

Almost surely, 2^1555135573 is an apocalyptic number.

It is an amenable number.

1555135573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555135573 is an equidigital number, since it uses as much as digits as its factorization.

1555135573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196875, while the sum is 40.

The square root of 1555135573 is about 39435.2072772542. The cubic root of 1555135573 is about 1158.5712624415.

The spelling of 1555135573 in words is "one billion, five hundred fifty-five million, one hundred thirty-five thousand, five hundred seventy-three".