1220554525 has 24 divisors (see below), whose sum is σ = 1624509864. Its totient is φ = 906393600.

The previous prime is 1220554519. The next prime is 1220554549. The reversal of 1220554525 is 5254550221.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 437730084 + 782824441 = 20922^2 + 27979^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1220554525 is a prime.

It is a Duffinian number.

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 23 ways as a sum of consecutive naturals, for example, 11355 + ... + 50695.

It is an arithmetic number, because the mean of its divisors is an integer number (67687911).

Almost surely, 2^1220554525 is an apocalyptic number.

It is an amenable number.

1220554525 is a deficient number, since it is larger than the sum of its proper divisors (403955339).

1220554525 is a wasteful number, since it uses less digits than its factorization.

1220554525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39441 (or 39436 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 1220554525 is about 34936.4354936218. The cubic root of 1220554525 is about 1068.6915980991.

The spelling of 1220554525 in words is "one billion, two hundred twenty million, five hundred fifty-four thousand, five hundred twenty-five".