46643981 has 2 divisors, whose sum is σ = 46643982. Its totient is φ = 46643980.

The previous prime is 46643963. The next prime is 46643983. The reversal of 46643981 is 18934664.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34456900 + 12187081 = 5870^2 + 3491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-46643981 is a prime.

It is a super-2 number, since 2×46643981² = 4351321927056722, which contains 22 as substring.

Together with 46643983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (46643983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23321990 + 23321991.

It is an arithmetic number, because the mean of its divisors is an integer number (23321991).

Almost surely, 2^46643981 is an apocalyptic number.

It is an amenable number.

46643981 is a deficient number, since it is larger than the sum of its proper divisors (1).

46643981 is an equidigital number, since it uses as much as digits as its factorization.

46643981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 46643981 is about 6829.6398880175. The cubic root of 46643981 is about 359.9690842793.

The spelling of 46643981 in words is "forty-six million, six hundred forty-three thousand, nine hundred eighty-one".