1355563121 has 24 divisors (see below), whose sum is σ = 1570208640. Its totient is φ = 1167059520.

The previous prime is 1355563103. The next prime is 1355563129. The reversal of 1355563121 is 1213655531.

It is not a de Polignac number, because 1355563121 - 2¹⁰ = 1355562097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1355563129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284285 + ... + 289013.

It is an arithmetic number, because the mean of its divisors is an integer number (65425360).

Almost surely, 2^1355563121 is an apocalyptic number.

1355563121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1355563121 is a deficient number, since it is larger than the sum of its proper divisors (214645519).

1355563121 is a wasteful number, since it uses less digits than its factorization.

1355563121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4877 (or 4866 counting only the distinct ones).

The product of its digits is 13500, while the sum is 32.

The square root of 1355563121 is about 36817.9727986211. The cubic root of 1355563121 is about 1106.7254959271.

The spelling of 1355563121 in words is "one billion, three hundred fifty-five million, five hundred sixty-three thousand, one hundred twenty-one".