1189435421 has 2 divisors, whose sum is σ = 1189435422. Its totient is φ = 1189435420.

The previous prime is 1189435399. The next prime is 1189435459. The reversal of 1189435421 is 1245349811.

It is an a-pointer prime, because the next prime (1189435459) can be obtained adding 1189435421 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 867950521 + 321484900 = 29461^2 + 17930^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189435421 - 2¹⁴ = 1189419037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1189431421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594717710 + 594717711.

It is an arithmetic number, because the mean of its divisors is an integer number (594717711).

Almost surely, 2^1189435421 is an apocalyptic number.

It is an amenable number.

1189435421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189435421 is an equidigital number, since it uses as much as digits as its factorization.

1189435421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 1189435421 is about 34488.1924867048. The cubic root of 1189435421 is about 1059.5308891945.

The spelling of 1189435421 in words is "one billion, one hundred eighty-nine million, four hundred thirty-five thousand, four hundred twenty-one".