1220727125 has 16 divisors (see below), whose sum is σ = 1564648176. Its totient is φ = 950184000.

The previous prime is 1220727121. The next prime is 1220727133. The reversal of 1220727125 is 5217270221.

It can be written as a sum of positive squares in 8 ways, for example, as 285407236 + 935319889 = 16894^2 + 30583^2 .

It is not a de Polignac number, because 1220727125 - 2² = 1220727121 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220727121) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 127346 + ... + 136595.

It is an arithmetic number, because the mean of its divisors is an integer number (97790511).

Almost surely, 2^1220727125 is an apocalyptic number.

It is an amenable number.

1220727125 is a deficient number, since it is larger than the sum of its proper divisors (343921051).

1220727125 is an equidigital number, since it uses as much as digits as its factorization.

1220727125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263993 (or 263983 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 1220727125 is about 34938.9056067874. The cubic root of 1220727125 is about 1068.7419706885.

Adding to 1220727125 its reverse (5217270221), we get a palindrome (6437997346).

The spelling of 1220727125 in words is "one billion, two hundred twenty million, seven hundred twenty-seven thousand, one hundred twenty-five".