161847025 has 6 divisors (see below), whose sum is σ = 200690342. Its totient is φ = 129477600.

The previous prime is 161847019. The next prime is 161847029. The reversal of 161847025 is 520748161.

It can be written as a sum of positive squares in 3 ways, for example, as 3389281 + 158457744 = 1841^2 + 12588^2 .

It is not a de Polignac number, because 161847025 - 2⁹ = 161846513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161847029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3236916 + ... + 3236965.

Almost surely, 2^161847025 is an apocalyptic number.

It is an amenable number.

161847025 is a deficient number, since it is larger than the sum of its proper divisors (38843317).

161847025 is an equidigital number, since it uses as much as digits as its factorization.

161847025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6473891 (or 6473886 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 161847025 is about 12721.9112164800. The cubic root of 161847025 is about 544.9645349085.

The spelling of 161847025 in words is "one hundred sixty-one million, eight hundred forty-seven thousand, twenty-five".