1965134389 has 2 divisors, whose sum is σ = 1965134390. Its totient is φ = 1965134388.

The previous prime is 1965134359. The next prime is 1965134393. The reversal of 1965134389 is 9834315691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1542132900 + 423001489 = 39270^2 + 20567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1965134389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1965134359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982567194 + 982567195.

It is an arithmetic number, because the mean of its divisors is an integer number (982567195).

Almost surely, 2^1965134389 is an apocalyptic number.

It is an amenable number.

1965134389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965134389 is an equidigital number, since it uses as much as digits as its factorization.

1965134389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 49.

The square root of 1965134389 is about 44329.8363294971. The cubic root of 1965134389 is about 1252.5567697638.

The spelling of 1965134389 in words is "one billion, nine hundred sixty-five million, one hundred thirty-four thousand, three hundred eighty-nine".