1620272001 has 4 divisors (see below), whose sum is σ = 2160362672. Its totient is φ = 1080181332.

The previous prime is 1620271993. The next prime is 1620272039. The reversal of 1620272001 is 1002720261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1620272001 - 2³ = 1620271993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620272701) 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, 270045331 + ... + 270045336.

It is an arithmetic number, because the mean of its divisors is an integer number (540090668).

Almost surely, 2^1620272001 is an apocalyptic number.

It is an amenable number.

1620272001 is a deficient number, since it is larger than the sum of its proper divisors (540090671).

1620272001 is an equidigital number, since it uses as much as digits as its factorization.

1620272001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540090670.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1620272001 is about 40252.6024127633. The cubic root of 1620272001 is about 1174.5260200249.

Adding to 1620272001 its reverse (1002720261), we get a palindrome (2622992262).

The spelling of 1620272001 in words is "one billion, six hundred twenty million, two hundred seventy-two thousand, one".