2145552481 has 2 divisors, whose sum is σ = 2145552482. Its totient is φ = 2145552480.

The previous prime is 2145552419. The next prime is 2145552517. The reversal of 2145552481 is 1842555412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2139987600 + 5564881 = 46260^2 + 2359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145552481 is a prime.

It is a super-2 number, since 2×2145552481² = 9206790897450510722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2145552481.

It is not a weakly prime, because it can be changed into another prime (2145550481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072776240 + 1072776241.

It is an arithmetic number, because the mean of its divisors is an integer number (1072776241).

Almost surely, 2^2145552481 is an apocalyptic number.

It is an amenable number.

2145552481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145552481 is an equidigital number, since it uses as much as digits as its factorization.

2145552481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64000, while the sum is 37.

The square root of 2145552481 is about 46320.1088189568. The cubic root of 2145552481 is about 1289.7723054248.

The spelling of 2145552481 in words is "two billion, one hundred forty-five million, five hundred fifty-two thousand, four hundred eighty-one".