3654980981 has 4 divisors (see below), whose sum is σ = 3714898764. Its totient is φ = 3595063200.

The previous prime is 3654980971. The next prime is 3654980993. The reversal of 3654980981 is 1890894563.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2082461956 + 1572519025 = 45634^2 + 39655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3654980981 is a prime.

It is a super-2 number, since 2×3654980981² = 26717771942943444722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654980971) 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 in 3 ways as a sum of consecutive naturals, for example, 29958800 + ... + 29958921.

It is an arithmetic number, because the mean of its divisors is an integer number (928724691).

Almost surely, 2^3654980981 is an apocalyptic number.

It is an amenable number.

3654980981 is a deficient number, since it is larger than the sum of its proper divisors (59917783).

3654980981 is an equidigital number, since it uses as much as digits as its factorization.

3654980981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59917782.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The square root of 3654980981 is about 60456.4387058980. The cubic root of 3654980981 is about 1540.3817826984.

The spelling of 3654980981 in words is "three billion, six hundred fifty-four million, nine hundred eighty thousand, nine hundred eighty-one".