1222152500 has 30 divisors (see below), whose sum is σ = 2672608554. Its totient is φ = 488860000.

The previous prime is 1222152499. The next prime is 1222152509. The reversal of 1222152500 is 52512221.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 190329616 + 1031822884 = 13796^2 + 32122^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222152509) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 241931 + ... + 246930.

Almost surely, 2^1222152500 is an apocalyptic number.

1222152500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222152500 is an abundant number, since it is smaller than the sum of its proper divisors (1450456054).

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

1222152500 is an equidigital number, since it uses as much as digits as its factorization.

1222152500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488885 (or 488868 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1222152500 is about 34959.2977618258. The cubic root of 1222152500 is about 1069.1577790282.

Adding to 1222152500 its reverse (52512221), we get a palindrome (1274664721).

The spelling of 1222152500 in words is "one billion, two hundred twenty-two million, one hundred fifty-two thousand, five hundred".