161212322 has 4 divisors (see below), whose sum is σ = 241818486. Its totient is φ = 80606160.

The previous prime is 161212301. The next prime is 161212327. The reversal of 161212322 is 223212161.

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

It can be written as a sum of positive squares in only one way, i.e., 161010721 + 201601 = 12689^2 + 449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161212294 and 161212303.

It is not an unprimeable number, because it can be changed into a prime (161212327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40303079 + ... + 40303082.

Almost surely, 2^161212322 is an apocalyptic number.

161212322 is a deficient number, since it is larger than the sum of its proper divisors (80606164).

161212322 is an equidigital number, since it uses as much as digits as its factorization.

161212322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80606163.

The product of its digits is 288, while the sum is 20.

The square root of 161212322 is about 12696.9414427255. The cubic root of 161212322 is about 544.2512198429.

Adding to 161212322 its reverse (223212161), we get a palindrome (384424483).

The spelling of 161212322 in words is "one hundred sixty-one million, two hundred twelve thousand, three hundred twenty-two".