1320553531 has 8 divisors (see below), whose sum is σ = 1487075328. Its totient is φ = 1161777000.

The previous prime is 1320553519. The next prime is 1320553537. The reversal of 1320553531 is 1353550231.

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 1320553531 - 2⁵ = 1320553499 is a prime.

It is a super-2 number, since 2×1320553531² = 3487723256473135922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320553531.

It is not an unprimeable number, because it can be changed into a prime (1320553537) 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, 1935955 + ... + 1936636.

It is an arithmetic number, because the mean of its divisors is an integer number (185884416).

Almost surely, 2^1320553531 is an apocalyptic number.

1320553531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320553531 is a deficient number, since it is larger than the sum of its proper divisors (166521797).

1320553531 is a wasteful number, since it uses less digits than its factorization.

1320553531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872633.

The product of its (nonzero) digits is 6750, while the sum is 28.

The square root of 1320553531 is about 36339.4211704039. The cubic root of 1320553531 is about 1097.1146229198.

The spelling of 1320553531 in words is "one billion, three hundred twenty million, five hundred fifty-three thousand, five hundred thirty-one".