1225621508 has 12 divisors (see below), whose sum is σ = 2145908940. Its totient is φ = 612504672.

The previous prime is 1225621489. The next prime is 1225621531. The reversal of 1225621508 is 8051265221.

It can be written as a sum of positive squares in 2 ways, for example, as 614147524 + 611473984 = 24782^2 + 24728^2 .

It is a super-3 number, since 3×1225621508³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67391 + ... + 83622.

It is an arithmetic number, because the mean of its divisors is an integer number (178825745).

Almost surely, 2^1225621508 is an apocalyptic number.

It is an amenable number.

1225621508 is a deficient number, since it is larger than the sum of its proper divisors (920287432).

1225621508 is a wasteful number, since it uses less digits than its factorization.

1225621508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153046 (or 153044 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 1225621508 is about 35008.8775598419. The cubic root of 1225621508 is about 1070.1684039247.

Adding to 1225621508 its reverse (8051265221), we get a palindrome (9276886729).

The spelling of 1225621508 in words is "one billion, two hundred twenty-five million, six hundred twenty-one thousand, five hundred eight".