2152400081 has 8 divisors (see below), whose sum is σ = 2318337000. Its totient is φ = 1986515712.

The previous prime is 2152400077. The next prime is 2152400093. The reversal of 2152400081 is 1800042512.

It can be written as a sum of positive squares in 4 ways, for example, as 508908481 + 1643491600 = 22559^2 + 40540^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2152400081 - 2² = 2152400077 is a prime.

It is a super-2 number, since 2×2152400081² = 9265652217377613122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2152400011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128795 + ... + 144543.

It is an arithmetic number, because the mean of its divisors is an integer number (289792125).

Almost surely, 2^2152400081 is an apocalyptic number.

It is an amenable number.

2152400081 is a deficient number, since it is larger than the sum of its proper divisors (165936919).

2152400081 is a wasteful number, since it uses less digits than its factorization.

2152400081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26275.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 2152400081 is about 46393.9659977459. The cubic root of 2152400081 is about 1291.1429649379.

Adding to 2152400081 its reverse (1800042512), we get a palindrome (3952442593).

The spelling of 2152400081 in words is "two billion, one hundred fifty-two million, four hundred thousand, eighty-one".