2145523546 has 4 divisors (see below), whose sum is σ = 3218285322. Its totient is φ = 1072761772.

The previous prime is 2145523543. The next prime is 2145523577. The reversal of 2145523546 is 6453255412.

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., 1239814521 + 905709025 = 35211^2 + 30095^2 .

It is not an unprimeable number, because it can be changed into a prime (2145523543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536380885 + ... + 536380888.

Almost surely, 2^2145523546 is an apocalyptic number.

2145523546 is a deficient number, since it is larger than the sum of its proper divisors (1072761776).

2145523546 is a wasteful number, since it uses less digits than its factorization.

2145523546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072761775.

The product of its digits is 144000, while the sum is 37.

The square root of 2145523546 is about 46319.7964805546. The cubic root of 2145523546 is about 1289.7665074264.

Adding to 2145523546 its reverse (6453255412), we get a palindrome (8598778958).

The spelling of 2145523546 in words is "two billion, one hundred forty-five million, five hundred twenty-three thousand, five hundred forty-six".