1951766489 has 2 divisors, whose sum is σ = 1951766490. Its totient is φ = 1951766488.

The previous prime is 1951766477. The next prime is 1951766491. The reversal of 1951766489 is 9846671591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1740558400 + 211208089 = 41720^2 + 14533^2 .

It is an emirp because it is prime and its reverse (9846671591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1951766489 - 2⁴ = 1951766473 is a prime.

Together with 1951766491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1951766429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975883244 + 975883245.

It is an arithmetic number, because the mean of its divisors is an integer number (975883245).

Almost surely, 2^1951766489 is an apocalyptic number.

It is an amenable number.

1951766489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951766489 is an equidigital number, since it uses as much as digits as its factorization.

1951766489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 56.

The square root of 1951766489 is about 44178.8013531377. The cubic root of 1951766489 is about 1249.7101170995.

The spelling of 1951766489 in words is "one billion, nine hundred fifty-one million, seven hundred sixty-six thousand, four hundred eighty-nine".