1355665531 has 16 divisors (see below), whose sum is σ = 1500247008. Its totient is φ = 1214752000.

The previous prime is 1355665489. The next prime is 1355665543.

It is a happy number.

1355665531 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1355665531 - 2⁹ = 1355665019 is a prime.

It is a super-2 number, since 2×1355665531² = 3675658063883023922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355665231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256245 + ... + 261481.

It is an arithmetic number, because the mean of its divisors is an integer number (93765438).

Almost surely, 2^1355665531 is an apocalyptic number.

1355665531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1355665531 is a deficient number, since it is larger than the sum of its proper divisors (144581477).

1355665531 is a wasteful number, since it uses less digits than its factorization.

1355665531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582.

The product of its digits is 202500, while the sum is 40.

The square root of 1355665531 is about 36819.3635333366. The cubic root of 1355665531 is about 1106.7533655020.

The spelling of 1355665531 in words is "one billion, three hundred fifty-five million, six hundred sixty-five thousand, five hundred thirty-one".