1220525817 has 16 divisors (see below), whose sum is σ = 1894942080. Its totient is φ = 684283392.

The previous prime is 1220525809. The next prime is 1220525833. The reversal of 1220525817 is 7185250221.

It is not a de Polignac number, because 1220525817 - 2³ = 1220525809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220525807) 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, 547192 + ... + 549417.

It is an arithmetic number, because the mean of its divisors is an integer number (118433880).

Almost surely, 2^1220525817 is an apocalyptic number.

It is an amenable number.

1220525817 is a deficient number, since it is larger than the sum of its proper divisors (674416263).

1220525817 is a wasteful number, since it uses less digits than its factorization.

1220525817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096672.

The product of its (nonzero) digits is 11200, while the sum is 33.

The square root of 1220525817 is about 34936.0246307447. The cubic root of 1220525817 is about 1068.6832193286.

The spelling of 1220525817 in words is "one billion, two hundred twenty million, five hundred twenty-five thousand, eight hundred seventeen".