161461969 has 4 divisors (see below), whose sum is σ = 165825844. Its totient is φ = 157098096.

The previous prime is 161461939. The next prime is 161461987. The reversal of 161461969 is 969164161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146095569 + 15366400 = 12087^2 + 3920^2 .

It is a cyclic number.

It is not a de Polignac number, because 161461969 - 2⁹ = 161461457 is a prime.

It is a super-2 number, since 2×161461969² = 52139934866713922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161461939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2181882 + ... + 2181955.

It is an arithmetic number, because the mean of its divisors is an integer number (41456461).

Almost surely, 2^161461969 is an apocalyptic number.

It is an amenable number.

161461969 is a deficient number, since it is larger than the sum of its proper divisors (4363875).

161461969 is an equidigital number, since it uses as much as digits as its factorization.

161461969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363874.

The product of its digits is 69984, while the sum is 43.

The square root of 161461969 is about 12706.7686293566. The cubic root of 161461969 is about 544.5320102280.

The spelling of 161461969 in words is "one hundred sixty-one million, four hundred sixty-one thousand, nine hundred sixty-nine".