3581781625 has 16 divisors (see below), whose sum is σ = 4471983360. Its totient is φ = 2864194800.

The previous prime is 3581781601. The next prime is 3581781631. The reversal of 3581781625 is 5261871853.

It is not a de Polignac number, because 3581781625 - 2⁹ = 3581781113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385282 + ... + 394468.

It is an arithmetic number, because the mean of its divisors is an integer number (279498960).

Almost surely, 2^3581781625 is an apocalyptic number.

It is an amenable number.

3581781625 is a deficient number, since it is larger than the sum of its proper divisors (890201735).

3581781625 is an equidigital number, since it uses as much as digits as its factorization.

3581781625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12321 (or 12311 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The square root of 3581781625 is about 59847.9876436961. The cubic root of 3581781625 is about 1530.0291370987.

The spelling of 3581781625 in words is "three billion, five hundred eighty-one million, seven hundred eighty-one thousand, six hundred twenty-five".