1205522891 has 2 divisors, whose sum is σ = 1205522892. Its totient is φ = 1205522890.

The previous prime is 1205522861. The next prime is 1205522911. The reversal of 1205522891 is 1982255021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1205522891 - 2²² = 1201328587 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205522861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602761445 + 602761446.

It is an arithmetic number, because the mean of its divisors is an integer number (602761446).

Almost surely, 2^1205522891 is an apocalyptic number.

1205522891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205522891 is an equidigital number, since it uses as much as digits as its factorization.

1205522891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 1205522891 is about 34720.6407054939. The cubic root of 1205522891 is about 1064.2863376918.

The spelling of 1205522891 in words is "one billion, two hundred five million, five hundred twenty-two thousand, eight hundred ninety-one".