47656421 has 2 divisors, whose sum is σ = 47656422. Its totient is φ = 47656420.

The previous prime is 47656403. The next prime is 47656429. The reversal of 47656421 is 12465674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24750625 + 22905796 = 4975^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 47656421 - 2¹⁰ = 47655397 is a prime.

It is a super-2 number, since 2×47656421² = 4542268925058482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47656429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23828210 + 23828211.

It is an arithmetic number, because the mean of its divisors is an integer number (23828211).

Almost surely, 2^47656421 is an apocalyptic number.

It is an amenable number.

47656421 is a deficient number, since it is larger than the sum of its proper divisors (1).

47656421 is an equidigital number, since it uses as much as digits as its factorization.

47656421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 35.

The square root of 47656421 is about 6903.3630210210. The cubic root of 47656421 is about 362.5549240599.

The spelling of 47656421 in words is "forty-seven million, six hundred fifty-six thousand, four hundred twenty-one".