1051666409 has 2 divisors, whose sum is σ = 1051666410. Its totient is φ = 1051666408.

The previous prime is 1051666403. The next prime is 1051666463. The reversal of 1051666409 is 9046661501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 915244009 + 136422400 = 30253^2 + 11680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051666409 - 2¹⁶ = 1051600873 is a prime.

It is a super-2 number, since 2×1051666409² = 2212004471637910562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1051666403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525833204 + 525833205.

It is an arithmetic number, because the mean of its divisors is an integer number (525833205).

Almost surely, 2^1051666409 is an apocalyptic number.

It is an amenable number.

1051666409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051666409 is an equidigital number, since it uses as much as digits as its factorization.

1051666409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1051666409 is about 32429.4065471448. The cubic root of 1051666409 is about 1016.9337653259.

The spelling of 1051666409 in words is "one billion, fifty-one million, six hundred sixty-six thousand, four hundred nine".