1620972001 has 8 divisors (see below), whose sum is σ = 1768785984. Its totient is φ = 1473233520.

The previous prime is 1620971999. The next prime is 1620972011. The reversal of 1620972001 is 1002790261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620972001 - 2¹ = 1620971999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620972011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31995 + ... + 65311.

It is an arithmetic number, because the mean of its divisors is an integer number (221098248).

Almost surely, 2^1620972001 is an apocalyptic number.

1620972001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1620972001 is a deficient number, since it is larger than the sum of its proper divisors (147813983).

1620972001 is a wasteful number, since it uses less digits than its factorization.

1620972001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37751.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1620972001 is about 40261.2965638217. The cubic root of 1620972001 is about 1174.6951376879.

The spelling of 1620972001 in words is "one billion, six hundred twenty million, nine hundred seventy-two thousand, one".