161212624 has 40 divisors (see below), whose sum is σ = 325325160. Its totient is φ = 77296128.

The previous prime is 161212619. The next prime is 161212627. The reversal of 161212624 is 426212161.

It is a happy number.

161212624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 58798224 + 102414400 = 7668^2 + 10120^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161212627) 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, 71742 + ... + 73954.

It is an arithmetic number, because the mean of its divisors is an integer number (8133129).

Almost surely, 2^161212624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161212624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162662580).

161212624 is an abundant number, since it is smaller than the sum of its proper divisors (164112536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161212624 is a wasteful number, since it uses less digits than its factorization.

161212624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407 (or 2401 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 161212624 is about 12696.9533353478. The cubic root of 161212624 is about 544.2515596924.

Adding to 161212624 its reverse (426212161), we get a palindrome (587424785).

The spelling of 161212624 in words is "one hundred sixty-one million, two hundred twelve thousand, six hundred twenty-four".