1220525501 has 16 divisors (see below), whose sum is σ = 1327468800. Its totient is φ = 1115494848.

The previous prime is 1220525497. The next prime is 1220525503. The reversal of 1220525501 is 1055250221.

It is not a de Polignac number, because 1220525501 - 2² = 1220525497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220525503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919100 + ... + 920426.

It is an arithmetic number, because the mean of its divisors is an integer number (82966800).

Almost surely, 2^1220525501 is an apocalyptic number.

It is an amenable number.

1220525501 is a deficient number, since it is larger than the sum of its proper divisors (106943299).

1220525501 is a wasteful number, since it uses less digits than its factorization.

1220525501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1220525501 is about 34936.0201081921. The cubic root of 1220525501 is about 1068.6831270995.

Adding to 1220525501 its reverse (1055250221), we get a palindrome (2275775722).

The spelling of 1220525501 in words is "one billion, two hundred twenty million, five hundred twenty-five thousand, five hundred one".