161498969 has 4 divisors (see below), whose sum is σ = 165863844. Its totient is φ = 157134096.

The previous prime is 161498951. The next prime is 161498971. The reversal of 161498969 is 969894161.

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: 969894161 = 7159 ⋅135479.

It can be written as a sum of positive squares in 2 ways, for example, as 114233344 + 47265625 = 10688^2 + 6875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161498969 is a prime.

It is a super-2 number, since 2×161498969² = 52163833976125922, which contains 22 as substring.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161498969.

It is not an unprimeable number, because it can be changed into a prime (161498069) 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, 2182382 + ... + 2182455.

It is an arithmetic number, because the mean of its divisors is an integer number (41465961).

Almost surely, 2^161498969 is an apocalyptic number.

It is an amenable number.

161498969 is a deficient number, since it is larger than the sum of its proper divisors (4364875).

161498969 is an equidigital number, since it uses as much as digits as its factorization.

161498969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364874.

The product of its digits is 839808, while the sum is 53.

The square root of 161498969 is about 12708.2244629216. The cubic root of 161498969 is about 544.5736013340.

The spelling of 161498969 in words is "one hundred sixty-one million, four hundred ninety-eight thousand, nine hundred sixty-nine".