41651981 has 4 divisors (see below), whose sum is σ = 47602272. Its totient is φ = 35701692.

The previous prime is 41651977. The next prime is 41652007. The reversal of 41651981 is 18915614.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 41651981 - 2² = 41651977 is a prime.

It is a super-2 number, since 2×41651981² = 3469775042448722, 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 (41651681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2975135 + ... + 2975148.

It is an arithmetic number, because the mean of its divisors is an integer number (11900568).

Almost surely, 2^41651981 is an apocalyptic number.

It is an amenable number.

41651981 is a deficient number, since it is larger than the sum of its proper divisors (5950291).

41651981 is an equidigital number, since it uses as much as digits as its factorization.

41651981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5950290.

The product of its digits is 8640, while the sum is 35.

The square root of 41651981 is about 6453.8345965790. The cubic root of 41651981 is about 346.6399024990.

The spelling of 41651981 in words is "forty-one million, six hundred fifty-one thousand, nine hundred eighty-one".