1206779591 has 2 divisors, whose sum is σ = 1206779592. Its totient is φ = 1206779590.

The previous prime is 1206779573. The next prime is 1206779603. The reversal of 1206779591 is 1959776021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1206779591 - 2¹⁸ = 1206517447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1206779551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603389795 + 603389796.

It is an arithmetic number, because the mean of its divisors is an integer number (603389796).

Almost surely, 2^1206779591 is an apocalyptic number.

1206779591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206779591 is an equidigital number, since it uses as much as digits as its factorization.

1206779591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 47.

The square root of 1206779591 is about 34738.7332958472. The cubic root of 1206779591 is about 1064.6560318065.

The spelling of 1206779591 in words is "one billion, two hundred six million, seven hundred seventy-nine thousand, five hundred ninety-one".