1355434121 has 4 divisors (see below), whose sum is σ = 1358036244. Its totient is φ = 1352832000.

The previous prime is 1355434109. The next prime is 1355434147. The reversal of 1355434121 is 1214345531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 368217721 + 987216400 = 19189^2 + 31420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355434121 - 2¹⁴ = 1355417737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355434151) 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 3 ways as a sum of consecutive naturals, for example, 1300280 + ... + 1301321.

It is an arithmetic number, because the mean of its divisors is an integer number (339509061).

Almost surely, 2^1355434121 is an apocalyptic number.

It is an amenable number.

1355434121 is a deficient number, since it is larger than the sum of its proper divisors (2602123).

1355434121 is an equidigital number, since it uses as much as digits as its factorization.

1355434121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2602122.

The product of its digits is 7200, while the sum is 29.

The square root of 1355434121 is about 36816.2208951435. The cubic root of 1355434121 is about 1106.6903882252.

Adding to 1355434121 its reverse (1214345531), we get a palindrome (2569779652).

The spelling of 1355434121 in words is "one billion, three hundred fifty-five million, four hundred thirty-four thousand, one hundred twenty-one".