1220536811 has 16 divisors (see below), whose sum is σ = 1424120544. Its totient is φ = 1035707904.

The previous prime is 1220536799. The next prime is 1220536817. The reversal of 1220536811 is 1186350221.

It is a cyclic number.

It is not a de Polignac number, because 1220536811 - 2¹⁸ = 1220274667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220536817) 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, 54716 + ... + 73721.

It is an arithmetic number, because the mean of its divisors is an integer number (89007534).

Almost surely, 2^1220536811 is an apocalyptic number.

1220536811 is a deficient number, since it is larger than the sum of its proper divisors (203583733).

1220536811 is a wasteful number, since it uses less digits than its factorization.

1220536811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128510.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1220536811 is about 34936.1819751386. The cubic root of 1220536811 is about 1068.6864280735.

The spelling of 1220536811 in words is "one billion, two hundred twenty million, five hundred thirty-six thousand, eight hundred eleven".