1355523431 has 4 divisors (see below), whose sum is σ = 1375755192. Its totient is φ = 1335291672.

The previous prime is 1355523419. The next prime is 1355523437. The reversal of 1355523431 is 1343255531.

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 1355523431 - 2¹⁸ = 1355261287 is a prime.

It is a super-2 number, since 2×1355523431² = 3674887543980023522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355523437) 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, 10115780 + ... + 10115913.

It is an arithmetic number, because the mean of its divisors is an integer number (343938798).

Almost surely, 2^1355523431 is an apocalyptic number.

1355523431 is a deficient number, since it is larger than the sum of its proper divisors (20231761).

1355523431 is an equidigital number, since it uses as much as digits as its factorization.

1355523431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20231760.

The product of its digits is 27000, while the sum is 32.

The square root of 1355523431 is about 36817.4337916156. The cubic root of 1355523431 is about 1106.7146944225.

Adding to 1355523431 its reverse (1343255531), we get a palindrome (2698778962).

The spelling of 1355523431 in words is "one billion, three hundred fifty-five million, five hundred twenty-three thousand, four hundred thirty-one".