2153531444 has 6 divisors (see below), whose sum is σ = 3768680034. Its totient is φ = 1076765720.

The previous prime is 2153531431. The next prime is 2153531449. The reversal of 2153531444 is 4441353512.

It can be written as a sum of positive squares in only one way, i.e., 1114758544 + 1038772900 = 33388^2 + 32230^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2153531444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153531449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269191427 + ... + 269191434.

It is an arithmetic number, because the mean of its divisors is an integer number (628113339).

Almost surely, 2^2153531444 is an apocalyptic number.

It is an amenable number.

2153531444 is a deficient number, since it is larger than the sum of its proper divisors (1615148590).

2153531444 is a wasteful number, since it uses less digits than its factorization.

2153531444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538382865 (or 538382863 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 2153531444 is about 46406.1573931736. The cubic root of 2153531444 is about 1291.3691458616.

Adding to 2153531444 its reverse (4441353512), we get a palindrome (6594884956).

The spelling of 2153531444 in words is "two billion, one hundred fifty-three million, five hundred thirty-one thousand, four hundred forty-four".