1361810138 has 8 divisors (see below), whose sum is σ = 2199847188. Its totient is φ = 628527744.

The previous prime is 1361810117. The next prime is 1361810141. The reversal of 1361810138 is 8310181631.

It can be written as a sum of positive squares in 2 ways, for example, as 1357701409 + 4108729 = 36847^2 + 2027^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26188631 + ... + 26188682.

Almost surely, 2^1361810138 is an apocalyptic number.

1361810138 is a deficient number, since it is larger than the sum of its proper divisors (838037050).

1361810138 is a wasteful number, since it uses less digits than its factorization.

1361810138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52377328.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1361810138 is about 36902.7117973734. The cubic root of 1361810138 is about 1108.4229798004.

Adding to 1361810138 its reverse (8310181631), we get a palindrome (9671991769).

The spelling of 1361810138 in words is "one billion, three hundred sixty-one million, eight hundred ten thousand, one hundred thirty-eight".