2641555391 has 2 divisors, whose sum is σ = 2641555392. Its totient is φ = 2641555390.

The previous prime is 2641555379. The next prime is 2641555409. The reversal of 2641555391 is 1935551462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2641555391 - 2⁶ = 2641555327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2641555321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320777695 + 1320777696.

It is an arithmetic number, because the mean of its divisors is an integer number (1320777696).

Almost surely, 2^2641555391 is an apocalyptic number.

2641555391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2641555391 is an equidigital number, since it uses as much as digits as its factorization.

2641555391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 41.

The square root of 2641555391 is about 51396.0639640819. The cubic root of 2641555391 is about 1382.3560172127.

The spelling of 2641555391 in words is "two billion, six hundred forty-one million, five hundred fifty-five thousand, three hundred ninety-one".