1189578641 has 2 divisors, whose sum is σ = 1189578642. Its totient is φ = 1189578640.

The previous prime is 1189578631. The next prime is 1189578661. The reversal of 1189578641 is 1468759811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 941201041 + 248377600 = 30679^2 + 15760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189578641 - 2¹⁰ = 1189577617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1189578641.

It is not a weakly prime, because it can be changed into another prime (1189578631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594789320 + 594789321.

It is an arithmetic number, because the mean of its divisors is an integer number (594789321).

Almost surely, 2^1189578641 is an apocalyptic number.

It is an amenable number.

1189578641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189578641 is an equidigital number, since it uses as much as digits as its factorization.

1189578641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 50.

The square root of 1189578641 is about 34490.2687870072. The cubic root of 1189578641 is about 1059.5734135499.

It can be divided in two parts, 118 and 9578641, that added together give a palindrome (9578759).

The spelling of 1189578641 in words is "one billion, one hundred eighty-nine million, five hundred seventy-eight thousand, six hundred forty-one".