1320555431 has 4 divisors (see below), whose sum is σ = 1422136632. Its totient is φ = 1218974232.

The previous prime is 1320555409. The next prime is 1320555433. The reversal of 1320555431 is 1345550231.

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 1320555431 - 2³⁰ = 246813607 is a prime.

It is a super-2 number, since 2×1320555431² = 3487733292687191522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320555394 and 1320555403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320555433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50790581 + ... + 50790606.

It is an arithmetic number, because the mean of its divisors is an integer number (355534158).

Almost surely, 2^1320555431 is an apocalyptic number.

1320555431 is a deficient number, since it is larger than the sum of its proper divisors (101581201).

1320555431 is a wasteful number, since it uses less digits than its factorization.

1320555431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101581200.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 1320555431 is about 36339.4473128032. The cubic root of 1320555431 is about 1097.1151490923.

The spelling of 1320555431 in words is "one billion, three hundred twenty million, five hundred fifty-five thousand, four hundred thirty-one".