2144707681 has 2 divisors, whose sum is σ = 2144707682. Its totient is φ = 2144707680.

The previous prime is 2144707597. The next prime is 2144707693. The reversal of 2144707681 is 1867074412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1569427456 + 575280225 = 39616^2 + 23985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144707681 - 2¹³ = 2144699489 is a prime.

It is a super-2 number, since 2×2144707681² = 9199542073880795522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2144707181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072353840 + 1072353841.

It is an arithmetic number, because the mean of its divisors is an integer number (1072353841).

Almost surely, 2^2144707681 is an apocalyptic number.

It is an amenable number.

2144707681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2144707681 is an equidigital number, since it uses as much as digits as its factorization.

2144707681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 2144707681 is about 46310.9887715648. The cubic root of 2144707681 is about 1289.6030028493.

The spelling of 2144707681 in words is "two billion, one hundred forty-four million, seven hundred seven thousand, six hundred eighty-one".