3781955549 has 2 divisors, whose sum is σ = 3781955550. Its totient is φ = 3781955548.

The previous prime is 3781955537. The next prime is 3781955561. The reversal of 3781955549 is 9455591873.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (3781955537) and next prime (3781955561).

It can be written as a sum of positive squares in only one way, i.e., 3061408900 + 720546649 = 55330^2 + 26843^2 .

It is a cyclic number.

It is not a de Polignac number, because 3781955549 - 2²⁸ = 3513520093 is a prime.

It is a super-2 number, since 2×3781955549² = 28606375549223782802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3781955494 and 3781955503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3781951549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890977774 + 1890977775.

It is an arithmetic number, because the mean of its divisors is an integer number (1890977775).

Almost surely, 2^3781955549 is an apocalyptic number.

It is an amenable number.

3781955549 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781955549 is an equidigital number, since it uses as much as digits as its factorization.

3781955549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804000, while the sum is 56.

The square root of 3781955549 is about 61497.6060428371. The cubic root of 3781955549 is about 1558.0168132562.

The spelling of 3781955549 in words is "three billion, seven hundred eighty-one million, nine hundred fifty-five thousand, five hundred forty-nine".