7120905989 has 2 divisors, whose sum is σ = 7120905990. Its totient is φ = 7120905988.

The previous prime is 7120905917. The next prime is 7120906049. The reversal of 7120905989 is 9895090217.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6765885025 + 355020964 = 82255^2 + 18842^2 .

It is an emirp because it is prime and its reverse (9895090217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7120905989 - 2¹⁶ = 7120840453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7120305989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560452994 + 3560452995.

It is an arithmetic number, because the mean of its divisors is an integer number (3560452995).

Almost surely, 2^7120905989 is an apocalyptic number.

It is an amenable number.

7120905989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7120905989 is an equidigital number, since it uses as much as digits as its factorization.

7120905989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 7120905989 is about 84385.4607678361. The cubic root of 7120905989 is about 1923.8819381605.

The spelling of 7120905989 in words is "seven billion, one hundred twenty million, nine hundred five thousand, nine hundred eighty-nine".