1260991111 has 2 divisors, whose sum is σ = 1260991112. Its totient is φ = 1260991110.

The previous prime is 1260991103. The next prime is 1260991139. The reversal of 1260991111 is 1111990621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1260991111 - 2³ = 1260991103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1260998111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630495555 + 630495556.

It is an arithmetic number, because the mean of its divisors is an integer number (630495556).

Almost surely, 2^1260991111 is an apocalyptic number.

1260991111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1260991111 is an equidigital number, since it uses as much as digits as its factorization.

1260991111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 31.

The square root of 1260991111 is about 35510.4366489628. The cubic root of 1260991111 is about 1080.3654201840.

The spelling of 1260991111 in words is "one billion, two hundred sixty million, nine hundred ninety-one thousand, one hundred eleven".