1561071165 has 8 divisors (see below), whose sum is σ = 2497713888. Its totient is φ = 832571280.

The previous prime is 1561071163. The next prime is 1561071167. The reversal of 1561071165 is 5611701651.

It is an interprime number because it is at equal distance from previous prime (1561071163) and next prime (1561071167).

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

It is not a de Polignac number, because 1561071165 - 2¹ = 1561071163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561071163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52035691 + ... + 52035720.

It is an arithmetic number, because the mean of its divisors is an integer number (312214236).

Almost surely, 2^1561071165 is an apocalyptic number.

1561071165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561071165 is a deficient number, since it is larger than the sum of its proper divisors (936642723).

1561071165 is a wasteful number, since it uses less digits than its factorization.

1561071165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104071419.

The product of its (nonzero) digits is 6300, while the sum is 33.

The square root of 1561071165 is about 39510.3931263661. The cubic root of 1561071165 is about 1160.0433904201.

The spelling of 1561071165 in words is "one billion, five hundred sixty-one million, seventy-one thousand, one hundred sixty-five".