261099011 has 2 divisors, whose sum is σ = 261099012. Its totient is φ = 261099010.

The previous prime is 261098983. The next prime is 261099031. The reversal of 261099011 is 110990162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261099011 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (261099031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130549505 + 130549506.

It is an arithmetic number, because the mean of its divisors is an integer number (130549506).

Almost surely, 2^261099011 is an apocalyptic number.

261099011 is a deficient number, since it is larger than the sum of its proper divisors (1).

261099011 is an equidigital number, since it uses as much as digits as its factorization.

261099011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 261099011 is about 16158.5584443663. The cubic root of 261099011 is about 639.1484532587.

The spelling of 261099011 in words is "two hundred sixty-one million, ninety-nine thousand, eleven".