1355115531 has 24 divisors (see below), whose sum is σ = 2292888384. Its totient is φ = 703955280.

The previous prime is 1355115497. The next prime is 1355115547.

1355115531 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1355115531 - 2⁶ = 1355115467 is a prime.

It is a super-2 number, since 2×1355115531² = 3672676204714823922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1355115551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 417405 + ... + 420638.

It is an arithmetic number, because the mean of its divisors is an integer number (95537016).

Almost surely, 2^1355115531 is an apocalyptic number.

1355115531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1355115531 is a deficient number, since it is larger than the sum of its proper divisors (937772853).

1355115531 is a wasteful number, since it uses less digits than its factorization.

1355115531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838071 (or 838064 counting only the distinct ones).

The product of its digits is 5625, while the sum is 30.

The square root of 1355115531 is about 36811.8938795602. The cubic root of 1355115531 is about 1106.6036735426.

It can be divided in two parts, 1355 and 115531, that added together give a triangular number (116886 = T₄₈₃).

The spelling of 1355115531 in words is "one billion, three hundred fifty-five million, one hundred fifteen thousand, five hundred thirty-one".