1189746521 has 2 divisors, whose sum is σ = 1189746522. Its totient is φ = 1189746520.

The previous prime is 1189746473. The next prime is 1189746527. The reversal of 1189746521 is 1256479811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739840000 + 449906521 = 27200^2 + 21211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189746521 - 2¹⁴ = 1189730137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1189746527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594873260 + 594873261.

It is an arithmetic number, because the mean of its divisors is an integer number (594873261).

Almost surely, 2^1189746521 is an apocalyptic number.

It is an amenable number.

1189746521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189746521 is an equidigital number, since it uses as much as digits as its factorization.

1189746521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 1189746521 is about 34492.7024310940. The cubic root of 1189746521 is about 1059.6232555167.

The spelling of 1189746521 in words is "one billion, one hundred eighty-nine million, seven hundred forty-six thousand, five hundred twenty-one".