2205640391 has 2 divisors, whose sum is σ = 2205640392. Its totient is φ = 2205640390.

The previous prime is 2205640363. The next prime is 2205640427. The reversal of 2205640391 is 1930465022.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2205640391 - 2¹⁴ = 2205624007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2205640331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102820195 + 1102820196.

It is an arithmetic number, because the mean of its divisors is an integer number (1102820196).

Almost surely, 2^2205640391 is an apocalyptic number.

2205640391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2205640391 is an equidigital number, since it uses as much as digits as its factorization.

2205640391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2205640391 is about 46964.2458791792. The cubic root of 2205640391 is about 1301.7019898755.

The spelling of 2205640391 in words is "two billion, two hundred five million, six hundred forty thousand, three hundred ninety-one".