1189953521 has 2 divisors, whose sum is σ = 1189953522. Its totient is φ = 1189953520.

The previous prime is 1189953517. The next prime is 1189953529. The reversal of 1189953521 is 1253599811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1189491121 + 462400 = 34489^2 + 680^2 .

It is an emirp because it is prime and its reverse (1253599811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1189953521 - 2² = 1189953517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1189953529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594976760 + 594976761.

It is an arithmetic number, because the mean of its divisors is an integer number (594976761).

Almost surely, 2^1189953521 is an apocalyptic number.

It is an amenable number.

1189953521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189953521 is an equidigital number, since it uses as much as digits as its factorization.

1189953521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 44.

The square root of 1189953521 is about 34495.7029352933. The cubic root of 1189953521 is about 1059.6847053831.

The spelling of 1189953521 in words is "one billion, one hundred eighty-nine million, nine hundred fifty-three thousand, five hundred twenty-one".