1920617389 has 2 divisors, whose sum is σ = 1920617390. Its totient is φ = 1920617388.

The previous prime is 1920617351. The next prime is 1920617393. The reversal of 1920617389 is 9837160291.

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., 1571488164 + 349129225 = 39642^2 + 18685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1920617389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920617089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960308694 + 960308695.

It is an arithmetic number, because the mean of its divisors is an integer number (960308695).

Almost surely, 2^1920617389 is an apocalyptic number.

It is an amenable number.

1920617389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920617389 is an equidigital number, since it uses as much as digits as its factorization.

1920617389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1920617389 is about 43824.8489900422. The cubic root of 1920617389 is about 1243.0262083249.

The spelling of 1920617389 in words is "one billion, nine hundred twenty million, six hundred seventeen thousand, three hundred eighty-nine".