1320405501 has 16 divisors (see below), whose sum is σ = 1770781760. Its totient is φ = 875162880.

The previous prime is 1320405497. The next prime is 1320405503. The reversal of 1320405501 is 1055040231.

It is not a de Polignac number, because 1320405501 - 2² = 1320405497 is a prime.

It is a super-2 number, since 2×1320405501² = 3486941374142122002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320405503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598266 + ... + 600468.

It is an arithmetic number, because the mean of its divisors is an integer number (110673860).

Almost surely, 2^1320405501 is an apocalyptic number.

It is an amenable number.

1320405501 is a deficient number, since it is larger than the sum of its proper divisors (450376259).

1320405501 is a wasteful number, since it uses less digits than its factorization.

1320405501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1320405501 is about 36337.3843445012. The cubic root of 1320405501 is about 1097.0736269933.

Adding to 1320405501 its reverse (1055040231), we get a palindrome (2375445732).

The spelling of 1320405501 in words is "one billion, three hundred twenty million, four hundred five thousand, five hundred one".