3505981 has 2 divisors, whose sum is σ = 3505982. Its totient is φ = 3505980.

The previous prime is 3505979. The next prime is 3505991. The reversal of 3505981 is 1895053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3481956 + 24025 = 1866^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 3505981 - 2¹ = 3505979 is a prime.

It is a super-2 number, since 2×3505981² = 24583805544722, which contains 22 as substring.

Together with 3505979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3505921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1752990 + 1752991.

It is an arithmetic number, because the mean of its divisors is an integer number (1752991).

Almost surely, 2^3505981 is an apocalyptic number.

It is an amenable number.

3505981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3505981 is an equidigital number, since it uses as much as digits as its factorization.

3505981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 3505981 is about 1872.4265005602. The cubic root of 3505981 is about 151.9158843229.

The spelling of 3505981 in words is "three million, five hundred five thousand, nine hundred eighty-one".