161298649 has 4 divisors (see below), whose sum is σ = 161968180. Its totient is φ = 160629120.

The previous prime is 161298637. The next prime is 161298661. The reversal of 161298649 is 946892161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946892161 = 193 ⋅4906177.

It is an interprime number because it is at equal distance from previous prime (161298637) and next prime (161298661).

It can be written as a sum of positive squares in 2 ways, for example, as 122323600 + 38975049 = 11060^2 + 6243^2 .

It is a cyclic number.

It is not a de Polignac number, because 161298649 - 2¹⁷ = 161167577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161298599 and 161298608.

It is not an unprimeable number, because it can be changed into a prime (161298679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334404 + ... + 334885.

It is an arithmetic number, because the mean of its divisors is an integer number (40492045).

Almost surely, 2^161298649 is an apocalyptic number.

It is an amenable number.

161298649 is a deficient number, since it is larger than the sum of its proper divisors (669531).

161298649 is an equidigital number, since it uses as much as digits as its factorization.

161298649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669530.

The product of its digits is 186624, while the sum is 46.

The square root of 161298649 is about 12700.3405072463. The cubic root of 161298649 is about 544.3483488767.

It can be divided in two parts, 16129 and 8649, that multiplied together give a square (139499721 = 11811²).

The spelling of 161298649 in words is "one hundred sixty-one million, two hundred ninety-eight thousand, six hundred forty-nine".