1620345001 has 12 divisors (see below), whose sum is σ = 1784607300. Its totient is φ = 1470091040.

The previous prime is 1620344993. The next prime is 1620345037. The reversal of 1620345001 is 1005430261.

It can be written as a sum of positive squares in 2 ways, for example, as 682515625 + 937829376 = 26125^2 + 30624^2 .

It is not a de Polignac number, because 1620345001 - 2³ = 1620344993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620345071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48435 + ... + 74743.

It is an arithmetic number, because the mean of its divisors is an integer number (148717275).

Almost surely, 2^1620345001 is an apocalyptic number.

1620345001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1620345001 is a deficient number, since it is larger than the sum of its proper divisors (164262299).

1620345001 is a wasteful number, since it uses less digits than its factorization.

1620345001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26840 (or 26829 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1620345001 is about 40253.5091762197. The cubic root of 1620345001 is about 1174.5436588558.

Adding to 1620345001 its reverse (1005430261), we get a palindrome (2625775262).

The spelling of 1620345001 in words is "one billion, six hundred twenty million, three hundred forty-five thousand, one".