161250565 has 16 divisors (see below), whose sum is σ = 221414400. Its totient is φ = 110436480.

The previous prime is 161250563. The next prime is 161250589. The reversal of 161250565 is 565052161.

161250565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161250565 - 2¹ = 161250563 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161250563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32361 + ... + 37009.

It is an arithmetic number, because the mean of its divisors is an integer number (13838400).

Almost surely, 2^161250565 is an apocalyptic number.

It is an amenable number.

161250565 is a deficient number, since it is larger than the sum of its proper divisors (60163835).

161250565 is an equidigital number, since it uses as much as digits as its factorization.

161250565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5652.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 161250565 is about 12698.4473460341. The cubic root of 161250565 is about 544.2942524382.

The spelling of 161250565 in words is "one hundred sixty-one million, two hundred fifty thousand, five hundred sixty-five".