1220894911 has 2 divisors, whose sum is σ = 1220894912. Its totient is φ = 1220894910.

The previous prime is 1220894903. The next prime is 1220894953. The reversal of 1220894911 is 1194980221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220894911 - 2³ = 1220894903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220894711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610447455 + 610447456.

It is an arithmetic number, because the mean of its divisors is an integer number (610447456).

Almost surely, 2^1220894911 is an apocalyptic number.

1220894911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220894911 is an equidigital number, since it uses as much as digits as its factorization.

1220894911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1220894911 is about 34941.3066584523. The cubic root of 1220894911 is about 1068.7909337810.

The spelling of 1220894911 in words is "one billion, two hundred twenty million, eight hundred ninety-four thousand, nine hundred eleven".