1355665331 has 4 divisors (see below), whose sum is σ = 1355953200. Its totient is φ = 1355377464.

The previous prime is 1355665303. The next prime is 1355665393. The reversal of 1355665331 is 1335665531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1355665331 - 2¹⁸ = 1355403187 is a prime.

It is a super-3 number, since 3×1355665331³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355665301) 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, 136751 + ... + 146328.

It is an arithmetic number, because the mean of its divisors is an integer number (338988300).

Almost surely, 2^1355665331 is an apocalyptic number.

1355665331 is a deficient number, since it is larger than the sum of its proper divisors (287869).

1355665331 is an equidigital number, since it uses as much as digits as its factorization.

1355665331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287868.

The product of its digits is 121500, while the sum is 38.

The square root of 1355665331 is about 36819.3608173743. The cubic root of 1355665331 is about 1106.7533110760.

It can be divided in two parts, 13556 and 65331, that added together give a palindrome (78887).

The spelling of 1355665331 in words is "one billion, three hundred fifty-five million, six hundred sixty-five thousand, three hundred thirty-one".