4368261991 has 2 divisors, whose sum is σ = 4368261992. Its totient is φ = 4368261990.

The previous prime is 4368261949. The next prime is 4368262021. The reversal of 4368261991 is 1991628634.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4368261991 - 2⁹ = 4368261479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4368261691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2184130995 + 2184130996.

It is an arithmetic number, because the mean of its divisors is an integer number (2184130996).

Almost surely, 2^4368261991 is an apocalyptic number.

4368261991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4368261991 is an equidigital number, since it uses as much as digits as its factorization.

4368261991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The square root of 4368261991 is about 66092.8285897948. The cubic root of 4368261991 is about 1634.6930865650.

The spelling of 4368261991 in words is "four billion, three hundred sixty-eight million, two hundred sixty-one thousand, nine hundred ninety-one".