1825159681 has 2 divisors, whose sum is σ = 1825159682. Its totient is φ = 1825159680.

The previous prime is 1825159667. The next prime is 1825159709. The reversal of 1825159681 is 1869515281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1781599681 + 43560000 = 42209^2 + 6600^2 .

It is an emirp because it is prime and its reverse (1869515281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1825159681 - 2²⁷ = 1690941953 is a prime.

It is a super-2 number, since 2×1825159681² = 6662415722296043522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1825159481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 912579840 + 912579841.

It is an arithmetic number, because the mean of its divisors is an integer number (912579841).

Almost surely, 2^1825159681 is an apocalyptic number.

It is an amenable number.

1825159681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1825159681 is an equidigital number, since it uses as much as digits as its factorization.

1825159681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 46.

The square root of 1825159681 is about 42721.8876104509. The cubic root of 1825159681 is about 1222.0818349464.

Subtracting 1825159681 from its reverse (1869515281), we obtain a square (44355600 = 6660²).

The spelling of 1825159681 in words is "one billion, eight hundred twenty-five million, one hundred fifty-nine thousand, six hundred eighty-one".