1820872601 has 16 divisors (see below), whose sum is σ = 2009690496. Its totient is φ = 1642519296.

The previous prime is 1820872591. The next prime is 1820872639. The reversal of 1820872601 is 1062780281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820872601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1820872681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20540 + ... + 63746.

It is an arithmetic number, because the mean of its divisors is an integer number (125605656).

Almost surely, 2^1820872601 is an apocalyptic number.

It is an amenable number.

1820872601 is a deficient number, since it is larger than the sum of its proper divisors (188817895).

1820872601 is a wasteful number, since it uses less digits than its factorization.

1820872601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43328.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 1820872601 is about 42671.6838313184. The cubic root of 1820872601 is about 1221.1242438449.

It can be divided in two parts, 18208 and 72601, that added together give a palindrome (90809).

The spelling of 1820872601 in words is "one billion, eight hundred twenty million, eight hundred seventy-two thousand, six hundred one".