1355538881 has 4 divisors (see below), whose sum is σ = 1355639232. Its totient is φ = 1355438532.

The previous prime is 1355538871. The next prime is 1355538883. The reversal of 1355538881 is 1888355531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1355538881 - 2⁶ = 1355538817 is a prime.

It is a super-2 number, since 2×1355538881² = 3674971315805464322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355538883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26045 + ... + 58218.

It is an arithmetic number, because the mean of its divisors is an integer number (338909808).

Almost surely, 2^1355538881 is an apocalyptic number.

It is an amenable number.

1355538881 is a deficient number, since it is larger than the sum of its proper divisors (100351).

1355538881 is an equidigital number, since it uses as much as digits as its factorization.

1355538881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100350.

The product of its digits is 576000, while the sum is 47.

The square root of 1355538881 is about 36817.6436100954. The cubic root of 1355538881 is about 1106.7188991149.

The spelling of 1355538881 in words is "one billion, three hundred fifty-five million, five hundred thirty-eight thousand, eight hundred eighty-one".