2145440377 has 2 divisors, whose sum is σ = 2145440378. Its totient is φ = 2145440376.

The previous prime is 2145440327. The next prime is 2145440399. The reversal of 2145440377 is 7730445412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1522638441 + 622801936 = 39021^2 + 24956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145440377 - 2¹¹ = 2145438329 is a prime.

It is a super-2 number, since 2×2145440377² = 9205828822523804258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2145440327) 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, 1072720188 + 1072720189.

It is an arithmetic number, because the mean of its divisors is an integer number (1072720189).

Almost surely, 2^2145440377 is an apocalyptic number.

It is an amenable number.

2145440377 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145440377 is an equidigital number, since it uses as much as digits as its factorization.

2145440377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 2145440377 is about 46318.8987023655. The cubic root of 2145440377 is about 1289.7498417231.

Adding to 2145440377 its reverse (7730445412), we get a palindrome (9875885789).

The spelling of 2145440377 in words is "two billion, one hundred forty-five million, four hundred forty thousand, three hundred seventy-seven".