40949981 has 2 divisors, whose sum is σ = 40949982. Its totient is φ = 40949980.

The previous prime is 40949969. The next prime is 40949989. The reversal of 40949981 is 18994904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24344356 + 16605625 = 4934^2 + 4075^2 .

It is a cyclic number.

It is not a de Polignac number, because 40949981 - 2⁶ = 40949917 is a prime.

It is a super-2 number, since 2×40949981² = 3353801887800722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40949989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20474990 + 20474991.

It is an arithmetic number, because the mean of its divisors is an integer number (20474991).

Almost surely, 2^40949981 is an apocalyptic number.

It is an amenable number.

40949981 is a deficient number, since it is larger than the sum of its proper divisors (1).

40949981 is an equidigital number, since it uses as much as digits as its factorization.

40949981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 40949981 is about 6399.2172177541. The cubic root of 40949981 is about 344.6814422783.

The spelling of 40949981 in words is "forty million, nine hundred forty-nine thousand, nine hundred eighty-one".