1561486138 has 16 divisors (see below), whose sum is σ = 2373215040. Its totient is φ = 770436576.

The previous prime is 1561486127. The next prime is 1561486163. The reversal of 1561486138 is 8316841651.

It is a junction number, because it is equal to n+sod(n) for n = 1561486094 and 1561486103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150523 + ... + 160561.

It is an arithmetic number, because the mean of its divisors is an integer number (148325940).

Almost surely, 2^1561486138 is an apocalyptic number.

1561486138 is a deficient number, since it is larger than the sum of its proper divisors (811728902).

1561486138 is a wasteful number, since it uses less digits than its factorization.

1561486138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11061.

The product of its digits is 138240, while the sum is 43.

The square root of 1561486138 is about 39515.6442184611. The cubic root of 1561486138 is about 1160.1461711363.

The spelling of 1561486138 in words is "one billion, five hundred sixty-one million, four hundred eighty-six thousand, one hundred thirty-eight".