2145491712 has 432 divisors, whose sum is σ = 7916330240. Its totient is φ = 564350976.

The previous prime is 2145491707. The next prime is 2145491713. The reversal of 2145491712 is 2171945412.

It is a tau number, because it is divible by the number of its divisors (432).

It is a super-4 number, since 4×2145491712⁴ (a number of 38 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2145491713) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5660739 + ... + 5661117.

Almost surely, 2^2145491712 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 2145491712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3958165120).

2145491712 is an abundant number, since it is smaller than the sum of its proper divisors (5770838528).

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

2145491712 is an equidigital number, since it uses as much as digits as its factorization.

2145491712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 404 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2145491712 is about 46319.4528465093. The cubic root of 2145491712 is about 1289.7601284659.

The spelling of 2145491712 in words is "two billion, one hundred forty-five million, four hundred ninety-one thousand, seven hundred twelve".