1072681661 has 2 divisors, whose sum is σ = 1072681662. Its totient is φ = 1072681660.

The previous prime is 1072681627. The next prime is 1072681699. The reversal of 1072681661 is 1661862701.

It is an a-pointer prime, because the next prime (1072681699) can be obtained adding 1072681661 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 740166436 + 332515225 = 27206^2 + 18235^2 .

It is an emirp because it is prime and its reverse (1661862701) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1072681661 - 2¹⁴ = 1072665277 is a prime.

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 (1072686661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536340830 + 536340831.

It is an arithmetic number, because the mean of its divisors is an integer number (536340831).

Almost surely, 2^1072681661 is an apocalyptic number.

It is an amenable number.

1072681661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1072681661 is an equidigital number, since it uses as much as digits as its factorization.

1072681661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1072681661 is about 32751.8192013818. The cubic root of 1072681661 is about 1023.6628722794.

The spelling of 1072681661 in words is "one billion, seventy-two million, six hundred eighty-one thousand, six hundred sixty-one".