961421189 has 2 divisors, whose sum is σ = 961421190. Its totient is φ = 961421188.

The previous prime is 961421173. The next prime is 961421191. The reversal of 961421189 is 981124169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 705964900 + 255456289 = 26570^2 + 15983^2 .

It is an emirp because it is prime and its reverse (981124169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961421189 - 2⁴ = 961421173 is a prime.

Together with 961421191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961421119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480710594 + 480710595.

It is an arithmetic number, because the mean of its divisors is an integer number (480710595).

Almost surely, 2^961421189 is an apocalyptic number.

It is an amenable number.

961421189 is a deficient number, since it is larger than the sum of its proper divisors (1).

961421189 is an equidigital number, since it uses as much as digits as its factorization.

961421189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 961421189 is about 31006.7926267778. The cubic root of 961421189 is about 986.9713888029.

It can be divided in two parts, 9614 and 21189, that added together give a palindrome (30803).

The spelling of 961421189 in words is "nine hundred sixty-one million, four hundred twenty-one thousand, one hundred eighty-nine".