1561417161 has 32 divisors (see below), whose sum is σ = 2176542720. Its totient is φ = 994896000.

The previous prime is 1561417133. The next prime is 1561417171. The reversal of 1561417161 is 1617141651.

It is a happy number.

It is not a de Polignac number, because 1561417161 - 2⁵ = 1561417129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561417171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1382445 + ... + 1383573.

It is an arithmetic number, because the mean of its divisors is an integer number (68016960).

Almost surely, 2^1561417161 is an apocalyptic number.

It is an amenable number.

1561417161 is a deficient number, since it is larger than the sum of its proper divisors (615125559).

1561417161 is a wasteful number, since it uses less digits than its factorization.

1561417161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397.

The product of its digits is 5040, while the sum is 33.

The square root of 1561417161 is about 39514.7714279103. The cubic root of 1561417161 is about 1160.1290881411.

The spelling of 1561417161 in words is "one billion, five hundred sixty-one million, four hundred seventeen thousand, one hundred sixty-one".