2155505279 has 2 divisors, whose sum is σ = 2155505280. Its totient is φ = 2155505278.

The previous prime is 2155505251. The next prime is 2155505311. The reversal of 2155505279 is 9725055512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155505279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155505249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077752639 + 1077752640.

It is an arithmetic number, because the mean of its divisors is an integer number (1077752640).

Almost surely, 2^2155505279 is an apocalyptic number.

2155505279 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155505279 is an equidigital number, since it uses as much as digits as its factorization.

2155505279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157500, while the sum is 41.

The square root of 2155505279 is about 46427.4194738411. The cubic root of 2155505279 is about 1291.7635633301.

The spelling of 2155505279 in words is "two billion, one hundred fifty-five million, five hundred five thousand, two hundred seventy-nine".