961620089 has 2 divisors, whose sum is σ = 961620090. Its totient is φ = 961620088.

The previous prime is 961620083. The next prime is 961620103. The reversal of 961620089 is 980026169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 938503225 + 23116864 = 30635^2 + 4808^2 .

It is an emirp because it is prime and its reverse (980026169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961620089 - 2¹⁶ = 961554553 is a prime.

It is not a weakly prime, because it can be changed into another prime (961620083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480810044 + 480810045.

It is an arithmetic number, because the mean of its divisors is an integer number (480810045).

Almost surely, 2^961620089 is an apocalyptic number.

It is an amenable number.

961620089 is a deficient number, since it is larger than the sum of its proper divisors (1).

961620089 is an equidigital number, since it uses as much as digits as its factorization.

961620089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 961620089 is about 31009.9998226379. Note that the first 3 decimals coincide. The cubic root of 961620089 is about 987.0394460621.

The spelling of 961620089 in words is "nine hundred sixty-one million, six hundred twenty thousand, eighty-nine".