3638140361 has 2 divisors, whose sum is σ = 3638140362. Its totient is φ = 3638140360.

The previous prime is 3638140357. The next prime is 3638140381. The reversal of 3638140361 is 1630418363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2157045136 + 1481095225 = 46444^2 + 38485^2 .

It is a cyclic number.

It is not a de Polignac number, because 3638140361 - 2² = 3638140357 is a prime.

It is not a weakly prime, because it can be changed into another prime (3638140381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819070180 + 1819070181.

It is an arithmetic number, because the mean of its divisors is an integer number (1819070181).

Almost surely, 2^3638140361 is an apocalyptic number.

It is an amenable number.

3638140361 is a deficient number, since it is larger than the sum of its proper divisors (1).

3638140361 is an equidigital number, since it uses as much as digits as its factorization.

3638140361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 3638140361 is about 60316.9989389393. The cubic root of 3638140361 is about 1538.0123286648.

The spelling of 3638140361 in words is "three billion, six hundred thirty-eight million, one hundred forty thousand, three hundred sixty-one".