1955681269 has 2 divisors, whose sum is σ = 1955681270. Its totient is φ = 1955681268.

The previous prime is 1955681249. The next prime is 1955681303. The reversal of 1955681269 is 9621865591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1639197169 + 316484100 = 40487^2 + 17790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1955681269 - 2⁹ = 1955680757 is a prime.

It is a super-2 number, since 2×1955681269² = 7649378451834900722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1955681209) 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, 977840634 + 977840635.

It is an arithmetic number, because the mean of its divisors is an integer number (977840635).

Almost surely, 2^1955681269 is an apocalyptic number.

It is an amenable number.

1955681269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955681269 is an equidigital number, since it uses as much as digits as its factorization.

1955681269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 52.

The square root of 1955681269 is about 44223.0852496747. The cubic root of 1955681269 is about 1250.5450996452.

The spelling of 1955681269 in words is "one billion, nine hundred fifty-five million, six hundred eighty-one thousand, two hundred sixty-nine".