1191513949 has 2 divisors, whose sum is σ = 1191513950. Its totient is φ = 1191513948.

The previous prime is 1191513943. The next prime is 1191514007. The reversal of 1191513949 is 9493151911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632522500 + 558991449 = 25150^2 + 23643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191513949 - 2³ = 1191513941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191513941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595756974 + 595756975.

It is an arithmetic number, because the mean of its divisors is an integer number (595756975).

Almost surely, 2^1191513949 is an apocalyptic number.

It is an amenable number.

1191513949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191513949 is an equidigital number, since it uses as much as digits as its factorization.

1191513949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 43.

The square root of 1191513949 is about 34518.3132409450. The cubic root of 1191513949 is about 1060.1477036967.

The spelling of 1191513949 in words is "one billion, one hundred ninety-one million, five hundred thirteen thousand, nine hundred forty-nine".