1205616091 has 2 divisors, whose sum is σ = 1205616092. Its totient is φ = 1205616090.

The previous prime is 1205616011. The next prime is 1205616107. The reversal of 1205616091 is 1906165021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1205616091 - 2²³ = 1197227483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205616011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602808045 + 602808046.

It is an arithmetic number, because the mean of its divisors is an integer number (602808046).

Almost surely, 2^1205616091 is an apocalyptic number.

1205616091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205616091 is an equidigital number, since it uses as much as digits as its factorization.

1205616091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 1205616091 is about 34721.9828206858. The cubic root of 1205616091 is about 1064.3137639457.

The spelling of 1205616091 in words is "one billion, two hundred five million, six hundred sixteen thousand, ninety-one".