1320431155 has 8 divisors (see below), whose sum is σ = 1586993184. Its totient is φ = 1054694400.

The previous prime is 1320431129. The next prime is 1320431179. The reversal of 1320431155 is 5511340231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1320431155 - 2¹⁹ = 1319906867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202791 + ... + 209200.

It is an arithmetic number, because the mean of its divisors is an integer number (198374148).

Almost surely, 2^1320431155 is an apocalyptic number.

1320431155 is a deficient number, since it is larger than the sum of its proper divisors (266562029).

1320431155 is an equidigital number, since it uses as much as digits as its factorization.

1320431155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412637.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1320431155 is about 36337.7373401262. The cubic root of 1320431155 is about 1097.0807319179.

Adding to 1320431155 its reverse (5511340231), we get a palindrome (6831771386).

The spelling of 1320431155 in words is "one billion, three hundred twenty million, four hundred thirty-one thousand, one hundred fifty-five".