1205523149 has 2 divisors, whose sum is σ = 1205523150. Its totient is φ = 1205523148.

The previous prime is 1205523119. The next prime is 1205523157. The reversal of 1205523149 is 9413255021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1029960649 + 175562500 = 32093^2 + 13250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205523149 - 2²⁰ = 1204474573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205523119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602761574 + 602761575.

It is an arithmetic number, because the mean of its divisors is an integer number (602761575).

Almost surely, 2^1205523149 is an apocalyptic number.

It is an amenable number.

1205523149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205523149 is an equidigital number, since it uses as much as digits as its factorization.

1205523149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1205523149 is about 34720.6444208629. The cubic root of 1205523149 is about 1064.2864136163.

The spelling of 1205523149 in words is "one billion, two hundred five million, five hundred twenty-three thousand, one hundred forty-nine".