1320013531 has 4 divisors (see below), whose sum is σ = 1320135232. Its totient is φ = 1319891832.

The previous prime is 1320013523. The next prime is 1320013547. The reversal of 1320013531 is 1353100231.

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 1320013531 - 2³ = 1320013523 is a prime.

It is a super-2 number, since 2×1320013531² = 3484871444046175922, 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 = 1320013499 and 1320013508.

It is not an unprimeable number, because it can be changed into a prime (1320013571) 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, 42795 + ... + 66868.

It is an arithmetic number, because the mean of its divisors is an integer number (330033808).

Almost surely, 2^1320013531 is an apocalyptic number.

1320013531 is a deficient number, since it is larger than the sum of its proper divisors (121701).

1320013531 is a wasteful number, since it uses less digits than its factorization.

1320013531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121700.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1320013531 is about 36331.9904629515. The cubic root of 1320013531 is about 1096.9650587019.

Adding to 1320013531 its reverse (1353100231), we get a palindrome (2673113762).

The spelling of 1320013531 in words is "one billion, three hundred twenty million, thirteen thousand, five hundred thirty-one".