1620143001 has 9 divisors (see below), whose sum is σ = 2340380991. Its totient is φ = 1080014832.

The previous prime is 1620142967. The next prime is 1620143011. The reversal of 1620143001 is 1003410261.

It is a happy number.

The square root of 1620143001 is 40251.

It is a perfect power (a square), and thus also a powerful number.

1620143001 is a `hidden beast` number, since 1 + 620 + 1 + 43 + 0 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 607376025 + 1012766976 = 24645^2 + 31824^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1620143001 - 2¹⁷ = 1620011929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620143011) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 114045 + ... + 127461.

Almost surely, 2^1620143001 is an apocalyptic number.

1620143001 is the 40251-st square number.

1620143001 is the 20126-th centered octagonal number.

It is an amenable number.

1620143001 is a deficient number, since it is larger than the sum of its proper divisors (720237990).

1620143001 is an frugal number, since it uses more digits than its factorization.

1620143001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26840 (or 13420 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The cubic root of 1620143001 is about 1174.4948487405.

Multiplying 1620143001 by its product of nonzero digits (144), we get a square (233300592144 = 483012²).

Adding to 1620143001 its reverse (1003410261), we get a palindrome (2623553262).

The spelling of 1620143001 in words is "one billion, six hundred twenty million, one hundred forty-three thousand, one".