1361161805 has 16 divisors (see below), whose sum is σ = 1720617600. Its totient is φ = 1030864320.

The previous prime is 1361161799. The next prime is 1361161871. The reversal of 1361161805 is 5081611631.

It is a de Polignac number, because none of the positive numbers 2^k-1361161805 is a prime.

It is a super-2 number, since 2×1361161805² = 3705522918781716050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149576 + ... + 158414.

It is an arithmetic number, because the mean of its divisors is an integer number (107538600).

Almost surely, 2^1361161805 is an apocalyptic number.

It is an amenable number.

1361161805 is a deficient number, since it is larger than the sum of its proper divisors (359455795).

1361161805 is a wasteful number, since it uses less digits than its factorization.

1361161805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10484.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1361161805 is about 36893.9263971727. The cubic root of 1361161805 is about 1108.2470518822.

The spelling of 1361161805 in words is "one billion, three hundred sixty-one million, one hundred sixty-one thousand, eight hundred five".