2145320154 has 64 divisors (see below), whose sum is σ = 4844743680. Its totient is φ = 712367136.

The previous prime is 2145320143. The next prime is 2145320159. The reversal of 2145320154 is 4510235412.

2145320154 is a `hidden beast` number, since 2 + 1 + 453 + 201 + 5 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2145320159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1368279 + ... + 1369845.

It is an arithmetic number, because the mean of its divisors is an integer number (75699120).

Almost surely, 2^2145320154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145320154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2422371840).

2145320154 is an abundant number, since it is smaller than the sum of its proper divisors (2699423526).

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

2145320154 is an equidigital number, since it uses as much as digits as its factorization.

2145320154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903 (or 1885 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 2145320154 is about 46317.6009093735. The cubic root of 2145320154 is about 1289.7257502447.

Adding to 2145320154 its reverse (4510235412), we get a palindrome (6655555566).

The spelling of 2145320154 in words is "two billion, one hundred forty-five million, three hundred twenty thousand, one hundred fifty-four".