47661281 has 2 divisors, whose sum is σ = 47661282. Its totient is φ = 47661280.

The previous prime is 47661277. The next prime is 47661283. The reversal of 47661281 is 18216674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31820881 + 15840400 = 5641^2 + 3980^2 .

It is a cyclic number.

It is not a de Polignac number, because 47661281 - 2² = 47661277 is a prime.

It is a super-2 number, since 2×47661281² = 4543195413121922, which contains 22 as substring.

Together with 47661283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47661283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23830640 + 23830641.

It is an arithmetic number, because the mean of its divisors is an integer number (23830641).

Almost surely, 2^47661281 is an apocalyptic number.

It is an amenable number.

47661281 is a deficient number, since it is larger than the sum of its proper divisors (1).

47661281 is an equidigital number, since it uses as much as digits as its factorization.

47661281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 47661281 is about 6903.7150143962. The cubic root of 47661281 is about 362.5672480867.

The spelling of 47661281 in words is "forty-seven million, six hundred sixty-one thousand, two hundred eighty-one".