2145431500 has 48 divisors (see below), whose sum is σ = 4693512096. Its totient is φ = 856728000.

The previous prime is 2145431489. The next prime is 2145431507. The reversal of 2145431500 is 51345412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (2145431507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323215 + ... + 329785.

It is an arithmetic number, because the mean of its divisors is an integer number (97781502).

Almost surely, 2^2145431500 is an apocalyptic number.

2145431500 is a gapful number since it is divisible by the number (20) 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 2145431500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2346756048).

2145431500 is an abundant number, since it is smaller than the sum of its proper divisors (2548080596).

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

2145431500 is a wasteful number, since it uses less digits than its factorization.

2145431500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7243 (or 7231 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 2145431500 is about 46318.8028774492. The cubic root of 2145431500 is about 1289.7480628925.

Adding to 2145431500 its reverse (51345412), we get a palindrome (2196776912).

The spelling of 2145431500 in words is "two billion, one hundred forty-five million, four hundred thirty-one thousand, five hundred".