2646436391 has 2 divisors, whose sum is σ = 2646436392. Its totient is φ = 2646436390.

The previous prime is 2646436367. The next prime is 2646436409. The reversal of 2646436391 is 1936346462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2646436391 - 2¹⁰ = 2646435367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2646436301) 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, 1323218195 + 1323218196.

It is an arithmetic number, because the mean of its divisors is an integer number (1323218196).

Almost surely, 2^2646436391 is an apocalyptic number.

2646436391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2646436391 is an equidigital number, since it uses as much as digits as its factorization.

2646436391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 44.

The square root of 2646436391 is about 51443.5262302265. The cubic root of 2646436391 is about 1383.2069209625.

The spelling of 2646436391 in words is "two billion, six hundred forty-six million, four hundred thirty-six thousand, three hundred ninety-one".