1825781601 has 24 divisors (see below), whose sum is σ = 2852526240. Its totient is φ = 1035676992.

The previous prime is 1825781533. The next prime is 1825781603. The reversal of 1825781601 is 1061875281.

It is not a de Polignac number, because 1825781601 - 2¹⁸ = 1825519457 is a prime.

It is a super-4 number, since 4×1825781601⁴ (a number of 38 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1825781601.

It is not an unprimeable number, because it can be changed into a prime (1825781603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25191 + ... + 65468.

It is an arithmetic number, because the mean of its divisors is an integer number (118855260).

Almost surely, 2^1825781601 is an apocalyptic number.

It is an amenable number.

1825781601 is a deficient number, since it is larger than the sum of its proper divisors (1026744639).

1825781601 is a wasteful number, since it uses less digits than its factorization.

1825781601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90813 (or 90806 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 39.

The square root of 1825781601 is about 42729.1656951081. The cubic root of 1825781601 is about 1222.2206266061.

The spelling of 1825781601 in words is "one billion, eight hundred twenty-five million, seven hundred eighty-one thousand, six hundred one".