47551681 has 2 divisors, whose sum is σ = 47551682. Its totient is φ = 47551680.

The previous prime is 47551667. The next prime is 47551687. The reversal of 47551681 is 18615574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38551681 + 9000000 = 6209^2 + 3000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47551681 is a prime.

It is a super-2 number, since 2×47551681² = 4522324731851522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 47551681.

It is not a weakly prime, because it can be changed into another prime (47551687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23775840 + 23775841.

It is an arithmetic number, because the mean of its divisors is an integer number (23775841).

Almost surely, 2^47551681 is an apocalyptic number.

It is an amenable number.

47551681 is a deficient number, since it is larger than the sum of its proper divisors (1).

47551681 is an equidigital number, since it uses as much as digits as its factorization.

47551681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The square root of 47551681 is about 6895.7726905692. The cubic root of 47551681 is about 362.2891196771.

The spelling of 47551681 in words is "forty-seven million, five hundred fifty-one thousand, six hundred eighty-one".