1225164500 has 192 divisors, whose sum is σ = 3302208000. Its totient is φ = 387532800.

The previous prime is 1225164497. The next prime is 1225164509. The reversal of 1225164500 is 54615221.

It is a self number, because there is not a number n which added to its sum of digits gives 1225164500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225164509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3510326 + ... + 3510674.

It is an arithmetic number, because the mean of its divisors is an integer number (17199000).

Almost surely, 2^1225164500 is an apocalyptic number.

1225164500 is a gapful number since it is divisible by the number (10) 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 1225164500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1651104000).

1225164500 is an abundant number, since it is smaller than the sum of its proper divisors (2077043500).

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

1225164500 is a wasteful number, since it uses less digits than its factorization.

1225164500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1225164500 is about 35002.3499211124. The cubic root of 1225164500 is about 1070.0353730991.

Adding to 1225164500 its reverse (54615221), we get a palindrome (1279779721).

The spelling of 1225164500 in words is "one billion, two hundred twenty-five million, one hundred sixty-four thousand, five hundred".