2145715538 has 4 divisors (see below), whose sum is σ = 3218573310. Its totient is φ = 1072857768.

The previous prime is 2145715513. The next prime is 2145715541. The reversal of 2145715538 is 8355175412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2016279409 + 129436129 = 44903^2 + 11377^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2145715495 and 2145715504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536428883 + ... + 536428886.

Almost surely, 2^2145715538 is an apocalyptic number.

2145715538 is a deficient number, since it is larger than the sum of its proper divisors (1072857772).

2145715538 is a wasteful number, since it uses less digits than its factorization.

2145715538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072857771.

The product of its digits is 168000, while the sum is 41.

The square root of 2145715538 is about 46321.8688958034. The cubic root of 2145715538 is about 1289.8049778293.

The spelling of 2145715538 in words is "two billion, one hundred forty-five million, seven hundred fifteen thousand, five hundred thirty-eight".