1221154325 has 12 divisors (see below), whose sum is σ = 1563078528. Its totient is φ = 945409200.

The previous prime is 1221154309. The next prime is 1221154331. The reversal of 1221154325 is 5234511221.

1221154325 = 6977² + 6978² + ... + 7001².

It is not a de Polignac number, because 1221154325 - 2⁴ = 1221154309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221154294 and 1221154303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 787067 + ... + 788616.

It is an arithmetic number, because the mean of its divisors is an integer number (130256544).

Almost surely, 2^1221154325 is an apocalyptic number.

It is an amenable number.

1221154325 is a deficient number, since it is larger than the sum of its proper divisors (341924203).

1221154325 is a wasteful number, since it uses less digits than its factorization.

1221154325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575724 (or 1575719 counting only the distinct ones).

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

The square root of 1221154325 is about 34945.0186006532. The cubic root of 1221154325 is about 1068.8666268085.

Adding to 1221154325 its reverse (5234511221), we get a palindrome (6455665546).

The spelling of 1221154325 in words is "one billion, two hundred twenty-one million, one hundred fifty-four thousand, three hundred twenty-five".