1561378136 has 8 divisors (see below), whose sum is σ = 2927584020. Its totient is φ = 780689064.

The previous prime is 1561378129. The next prime is 1561378163. The reversal of 1561378136 is 6318731651.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1561378093 and 1561378102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97586126 + ... + 97586141.

Almost surely, 2^1561378136 is an apocalyptic number.

It is an amenable number.

1561378136 is a deficient number, since it is larger than the sum of its proper divisors (1366205884).

1561378136 is a wasteful number, since it uses less digits than its factorization.

1561378136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195172273 (or 195172269 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 1561378136 is about 39514.2776221456. The cubic root of 1561378136 is about 1160.1194229011.

The spelling of 1561378136 in words is "one billion, five hundred sixty-one million, three hundred seventy-eight thousand, one hundred thirty-six".