1220137811 has 2 divisors, whose sum is σ = 1220137812. Its totient is φ = 1220137810.

The previous prime is 1220137783. The next prime is 1220137817. The reversal of 1220137811 is 1187310221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220137811 - 2⁶ = 1220137747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1220137817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610068905 + 610068906.

It is an arithmetic number, because the mean of its divisors is an integer number (610068906).

Almost surely, 2^1220137811 is an apocalyptic number.

1220137811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220137811 is an equidigital number, since it uses as much as digits as its factorization.

1220137811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1220137811 is about 34930.4710961647. The cubic root of 1220137811 is about 1068.5699622818.

The spelling of 1220137811 in words is "one billion, two hundred twenty million, one hundred thirty-seven thousand, eight hundred eleven".