4378601261 has 2 divisors, whose sum is σ = 4378601262. Its totient is φ = 4378601260.

The previous prime is 4378601239. The next prime is 4378601267. The reversal of 4378601261 is 1621068734.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3477460900 + 901140361 = 58970^2 + 30019^2 .

It is a cyclic number.

It is not a de Polignac number, because 4378601261 - 2¹⁸ = 4378339117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4378601267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2189300630 + 2189300631.

It is an arithmetic number, because the mean of its divisors is an integer number (2189300631).

Almost surely, 2^4378601261 is an apocalyptic number.

It is an amenable number.

4378601261 is a deficient number, since it is larger than the sum of its proper divisors (1).

4378601261 is an equidigital number, since it uses as much as digits as its factorization.

4378601261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 4378601261 is about 66171.0001511236. Note that the first 3 decimals coincide. The cubic root of 4378601261 is about 1635.9817925343.

Adding to 4378601261 its reverse (1621068734), we get a palindrome (5999669995).

The spelling of 4378601261 in words is "four billion, three hundred seventy-eight million, six hundred one thousand, two hundred sixty-one".