1320203531 has 8 divisors (see below), whose sum is σ = 1333321440. Its totient is φ = 1307104128.

The previous prime is 1320203449. The next prime is 1320203551. The reversal of 1320203531 is 1353020231.

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

It is a cyclic number.

It is not a de Polignac number, because 1320203531 - 2¹⁴ = 1320187147 is a prime.

It is a super-2 number, since 2×1320203531² = 3485874726529735922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320203551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171395 + ... + 178931.

It is an arithmetic number, because the mean of its divisors is an integer number (166665180).

Almost surely, 2^1320203531 is an apocalyptic number.

1320203531 is a deficient number, since it is larger than the sum of its proper divisors (13117909).

1320203531 is a wasteful number, since it uses less digits than its factorization.

1320203531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9253.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 1320203531 is about 36334.6051444074. The cubic root of 1320203531 is about 1097.0176877992.

Adding to 1320203531 its reverse (1353020231), we get a palindrome (2673223762).

The spelling of 1320203531 in words is "one billion, three hundred twenty million, two hundred three thousand, five hundred thirty-one".