3651061081 has 2 divisors, whose sum is σ = 3651061082. Its totient is φ = 3651061080.

The previous prime is 3651061079. The next prime is 3651061093. The reversal of 3651061081 is 1801601563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3129395481 + 521665600 = 55941^2 + 22840^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651061081 - 2¹ = 3651061079 is a prime.

It is a super-2 number, since 2×3651061081² = 26660494034385777122, which contains 22 as substring.

Together with 3651061079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3651061781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1825530540 + 1825530541.

It is an arithmetic number, because the mean of its divisors is an integer number (1825530541).

Almost surely, 2^3651061081 is an apocalyptic number.

It is an amenable number.

3651061081 is a deficient number, since it is larger than the sum of its proper divisors (1).

3651061081 is an equidigital number, since it uses as much as digits as its factorization.

3651061081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 3651061081 is about 60424.0107986883. The cubic root of 3651061081 is about 1539.8309086567.

The spelling of 3651061081 in words is "three billion, six hundred fifty-one million, sixty-one thousand, eighty-one".