1611322812 has 72 divisors (see below), whose sum is σ = 4472936832. Its totient is φ = 485028000.

The previous prime is 1611322793. The next prime is 1611322813. The reversal of 1611322812 is 2182231161.

1611322812 is a `hidden beast` number, since 1 + 611 + 32 + 2 + 8 + 12 = 666.

It is a super-2 number, since 2×1611322812² = 5192722408943174688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611322813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46323 + ... + 73269.

Almost surely, 2^1611322812 is an apocalyptic number.

1611322812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1611322812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236468416).

1611322812 is an abundant number, since it is smaller than the sum of its proper divisors (2861614020).

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

1611322812 is a wasteful number, since it uses less digits than its factorization.

1611322812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27119 (or 27114 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1611322812 is about 40141.2856296357. The cubic root of 1611322812 is about 1172.3596210688.

Adding to 1611322812 its reverse (2182231161), we get a palindrome (3793553973).

It can be divided in two parts, 1611 and 322812, that added together give a palindrome (324423).

The spelling of 1611322812 in words is "one billion, six hundred eleven million, three hundred twenty-two thousand, eight hundred twelve".