2015201881 has 45 divisors (see below), whose sum is σ = 2628191055. Its totient is φ = 1540659120.

The previous prime is 2015201863. The next prime is 2015201887. The reversal of 2015201881 is 1881025102.

The square root of 2015201881 is 44891.

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

It can be written as a sum of positive squares in only one way, i.e., 1452753225 + 562448656 = 38115^2 + 23716^2 .

It is not a de Polignac number, because 2015201881 - 2¹⁵ = 2015169113 is a prime.

It is a super-2 number, since 2×2015201881² = 8122077242371876322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2015201887) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 38022651 + ... + 38022703.

Almost surely, 2^2015201881 is an apocalyptic number.

2015201881 is the 44891-st square number.

2015201881 is the 22446-th centered octagonal number.

It is an amenable number.

2015201881 is a deficient number, since it is larger than the sum of its proper divisors (612989174).

2015201881 is an frugal number, since it uses more digits than its factorization.

2015201881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 28.

The cubic root of 2015201881 is about 1263.1051909595.

Adding to 2015201881 its reverse (1881025102), we get a palindrome (3896226983).

It can be divided in two parts, 201520 and 1881, that added together give a square (203401 = 451²).

The spelling of 2015201881 in words is "two billion, fifteen million, two hundred one thousand, eight hundred eighty-one".