161223602 has 4 divisors (see below), whose sum is σ = 241835406. Its totient is φ = 80611800.

The previous prime is 161223593. The next prime is 161223611. The reversal of 161223602 is 206322161.

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

It is an interprime number because it is at equal distance from previous prime (161223593) and next prime (161223611).

It can be written as a sum of positive squares in only one way, i.e., 122522761 + 38700841 = 11069^2 + 6221^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40305899 + ... + 40305902.

Almost surely, 2^161223602 is an apocalyptic number.

161223602 is a deficient number, since it is larger than the sum of its proper divisors (80611804).

161223602 is an equidigital number, since it uses as much as digits as its factorization.

161223602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80611803.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 161223602 is about 12697.3856364214. The cubic root of 161223602 is about 544.2639132701.

Adding to 161223602 its reverse (206322161), we get a palindrome (367545763).

The spelling of 161223602 in words is "one hundred sixty-one million, two hundred twenty-three thousand, six hundred two".