47440681 has 2 divisors, whose sum is σ = 47440682. Its totient is φ = 47440680.

The previous prime is 47440669. The next prime is 47440691. The reversal of 47440681 is 18604474.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29800681 + 17640000 = 5459^2 + 4200^2 .

It is a cyclic number.

It is not a de Polignac number, because 47440681 - 2⁷ = 47440553 is a prime.

It is a super-2 number, since 2×47440681² = 4501236427487522, which contains 22 as substring.

It is equal to p_2856580 and since 47440681 and 2856580 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (47440621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23720340 + 23720341.

It is an arithmetic number, because the mean of its divisors is an integer number (23720341).

Almost surely, 2^47440681 is an apocalyptic number.

It is an amenable number.

47440681 is a deficient number, since it is larger than the sum of its proper divisors (1).

47440681 is an equidigital number, since it uses as much as digits as its factorization.

47440681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 47440681 is about 6887.7195790770. The cubic root of 47440681 is about 362.0070026015.

The spelling of 47440681 in words is "forty-seven million, four hundred forty thousand, six hundred eighty-one".