3651825581 has 2 divisors, whose sum is σ = 3651825582. Its totient is φ = 3651825580.

The previous prime is 3651825497. The next prime is 3651825689. The reversal of 3651825581 is 1855281563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3211035556 + 440790025 = 56666^2 + 20995^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651825581 - 2¹⁸ = 3651563437 is a prime.

It is a super-2 number, since 2×3651825581² = 26671660148091975122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3651825781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1825912790 + 1825912791.

It is an arithmetic number, because the mean of its divisors is an integer number (1825912791).

Almost surely, 2^3651825581 is an apocalyptic number.

It is an amenable number.

3651825581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3651825581 is an equidigital number, since it uses as much as digits as its factorization.

3651825581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 44.

The square root of 3651825581 is about 60430.3365951241. The cubic root of 3651825581 is about 1539.9383768280.

The spelling of 3651825581 in words is "three billion, six hundred fifty-one million, eight hundred twenty-five thousand, five hundred eighty-one".