1620236201 has 4 divisors (see below), whose sum is σ = 1640745600. Its totient is φ = 1599726804.

The previous prime is 1620236113. The next prime is 1620236203. The reversal of 1620236201 is 1026320261.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1026320261 = 139 ⋅7383599.

It is a cyclic number.

It is not a de Polignac number, because 1620236201 - 2²² = 1616041897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620236203) 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, 10254581 + ... + 10254738.

It is an arithmetic number, because the mean of its divisors is an integer number (410186400).

Almost surely, 2^1620236201 is an apocalyptic number.

It is an amenable number.

1620236201 is a deficient number, since it is larger than the sum of its proper divisors (20509399).

1620236201 is an equidigital number, since it uses as much as digits as its factorization.

1620236201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20509398.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1620236201 is about 40252.1577185621. The cubic root of 1620236201 is about 1174.5173695552.

Adding to 1620236201 its reverse (1026320261), we get a palindrome (2646556462).

The spelling of 1620236201 in words is "one billion, six hundred twenty million, two hundred thirty-six thousand, two hundred one".