3125803781 has 2 divisors, whose sum is σ = 3125803782. Its totient is φ = 3125803780.

The previous prime is 3125803739. The next prime is 3125803841. The reversal of 3125803781 is 1873085213.

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., 3031053025 + 94750756 = 55055^2 + 9734^2 .

It is a cyclic number.

It is not a de Polignac number, because 3125803781 - 2¹⁸ = 3125541637 is a prime.

It is a super-2 number, since 2×3125803781² = 19541298554627791922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3125803181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1562901890 + 1562901891.

It is an arithmetic number, because the mean of its divisors is an integer number (1562901891).

Almost surely, 2^3125803781 is an apocalyptic number.

It is an amenable number.

3125803781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3125803781 is an equidigital number, since it uses as much as digits as its factorization.

3125803781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 3125803781 is about 55908.8882110886. Note that the first 3 decimals coincide. The cubic root of 3125803781 is about 1462.1342060892.

Adding to 3125803781 its reverse (1873085213), we get a palindrome (4998888994).

The spelling of 3125803781 in words is "three billion, one hundred twenty-five million, eight hundred three thousand, seven hundred eighty-one".