1191725149 has 2 divisors, whose sum is σ = 1191725150. Its totient is φ = 1191725148.

The previous prime is 1191725137. The next prime is 1191725167. The reversal of 1191725149 is 9415271911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963171225 + 228553924 = 31035^2 + 15118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1191725149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191725849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595862574 + 595862575.

It is an arithmetic number, because the mean of its divisors is an integer number (595862575).

Almost surely, 2^1191725149 is an apocalyptic number.

It is an amenable number.

1191725149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191725149 is an equidigital number, since it uses as much as digits as its factorization.

1191725149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 40.

The square root of 1191725149 is about 34521.3723510523. The cubic root of 1191725149 is about 1060.2103382878.

The spelling of 1191725149 in words is "one billion, one hundred ninety-one million, seven hundred twenty-five thousand, one hundred forty-nine".