1955011111 has 2 divisors, whose sum is σ = 1955011112. Its totient is φ = 1955011110.

The previous prime is 1955011103. The next prime is 1955011117. The reversal of 1955011111 is 1111105591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1955011111 - 2³ = 1955011103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1955011117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977505555 + 977505556.

It is an arithmetic number, because the mean of its divisors is an integer number (977505556).

Almost surely, 2^1955011111 is an apocalyptic number.

1955011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955011111 is an equidigital number, since it uses as much as digits as its factorization.

1955011111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 25.

The square root of 1955011111 is about 44215.5075850091. The cubic root of 1955011111 is about 1250.4022408946.

The spelling of 1955011111 in words is "one billion, nine hundred fifty-five million, eleven thousand, one hundred eleven".