1225522600 has 48 divisors (see below), whose sum is σ = 2947607100. Its totient is φ = 473303040.

The previous prime is 1225522589. The next prime is 1225522607. The reversal of 1225522600 is 62255221.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 614147524 + 611375076 = 24782^2 + 24726^2 .

It is a super-2 number, since 2×1225522600² = 3003811286221520000, which contains 22 as substring.

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 (1225522607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99849 + ... + 111448.

Almost surely, 2^1225522600 is an apocalyptic number.

1225522600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225522600 is an abundant number, since it is smaller than the sum of its proper divisors (1722084500).

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

1225522600 is a wasteful number, since it uses less digits than its factorization.

1225522600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211342 (or 211333 counting only the distinct ones).

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

The square root of 1225522600 is about 35007.4649182142. The cubic root of 1225522600 is about 1070.1396155200.

Adding to 1225522600 its reverse (62255221), we get a palindrome (1287777821).

The spelling of 1225522600 in words is "one billion, two hundred twenty-five million, five hundred twenty-two thousand, six hundred".