161312512 has 18 divisors (see below), whose sum is σ = 321995408. Its totient is φ = 80656128.

The previous prime is 161312509. The next prime is 161312513. The reversal of 161312512 is 215213161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161312513) by changing a digit.

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, 314808 + ... + 315319.

Almost surely, 2^161312512 is an apocalyptic number.

It is an amenable number.

161312512 is a deficient number, since it is larger than the sum of its proper divisors (160682896).

161312512 is an frugal number, since it uses more digits than its factorization.

161312512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630143 (or 630129 counting only the distinct ones).

The product of its digits is 360, while the sum is 22.

The square root of 161312512 is about 12700.8862682885. The cubic root of 161312512 is about 544.3639433139.

Adding to 161312512 its reverse (215213161), we get a palindrome (376525673).

It can be divided in two parts, 161312 and 512, that multiplied together give a square (82591744 = 9088²).

The spelling of 161312512 in words is "one hundred sixty-one million, three hundred twelve thousand, five hundred twelve".