1489753781 has 2 divisors, whose sum is σ = 1489753782. Its totient is φ = 1489753780.

The previous prime is 1489753753. The next prime is 1489753789. The reversal of 1489753781 is 1873579841.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1178548900 + 311204881 = 34330^2 + 17641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1489753781 - 2¹⁴ = 1489737397 is a prime.

It is a super-2 number, since 2×1489753781² = 4438732656007591922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1489753789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 744876890 + 744876891.

It is an arithmetic number, because the mean of its divisors is an integer number (744876891).

Almost surely, 2^1489753781 is an apocalyptic number.

It is an amenable number.

1489753781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1489753781 is an equidigital number, since it uses as much as digits as its factorization.

1489753781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 53.

The square root of 1489753781 is about 38597.3286769953. The cubic root of 1489753781 is about 1142.1018423718.

The spelling of 1489753781 in words is "one billion, four hundred eighty-nine million, seven hundred fifty-three thousand, seven hundred eighty-one".