4078213261 has 2 divisors, whose sum is σ = 4078213262. Its totient is φ = 4078213260.

The previous prime is 4078213259. The next prime is 4078213289. The reversal of 4078213261 is 1623128704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3818004100 + 260209161 = 61790^2 + 16131^2 .

It is a cyclic number.

It is not a de Polignac number, because 4078213261 - 2¹ = 4078213259 is a prime.

Together with 4078213259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4078213201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039106630 + 2039106631.

It is an arithmetic number, because the mean of its divisors is an integer number (2039106631).

Almost surely, 2^4078213261 is an apocalyptic number.

It is an amenable number.

4078213261 is a deficient number, since it is larger than the sum of its proper divisors (1).

4078213261 is an equidigital number, since it uses as much as digits as its factorization.

4078213261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 4078213261 is about 63860.8899170690. The cubic root of 4078213261 is about 1597.6806578915.

The spelling of 4078213261 in words is "four billion, seventy-eight million, two hundred thirteen thousand, two hundred sixty-one".