161623312 has 40 divisors (see below), whose sum is σ = 322088760. Its totient is φ = 78520320.

The previous prime is 161623309. The next prime is 161623313. The reversal of 161623312 is 213326161.

It can be written as a sum of positive squares in 4 ways, for example, as 13660416 + 147962896 = 3696^2 + 12164^2 .

It is a super-2 number, since 2×161623312² = 52244189963698688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161623313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283764 + ... + 284332.

It is an arithmetic number, because the mean of its divisors is an integer number (8052219).

Almost surely, 2^161623312 is an apocalyptic number.

It is an amenable number.

161623312 is a deficient number, since it is larger than the sum of its proper divisors (160465448).

161623312 is a wasteful number, since it uses less digits than its factorization.

161623312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051 (or 1045 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 161623312 is about 12713.1157471330. The cubic root of 161623312 is about 544.7133267758.

Adding to 161623312 its reverse (213326161), we get a palindrome (374949473).

The spelling of 161623312 in words is "one hundred sixty-one million, six hundred twenty-three thousand, three hundred twelve".