47651621 has 2 divisors, whose sum is σ = 47651622. Its totient is φ = 47651620.

The previous prime is 47651609. The next prime is 47651623. The reversal of 47651621 is 12615674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46430596 + 1221025 = 6814^2 + 1105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47651621 is a prime.

Together with 47651623, 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 (47651623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23825810 + 23825811.

It is an arithmetic number, because the mean of its divisors is an integer number (23825811).

Almost surely, 2^47651621 is an apocalyptic number.

It is an amenable number.

47651621 is a deficient number, since it is larger than the sum of its proper divisors (1).

47651621 is an equidigital number, since it uses as much as digits as its factorization.

47651621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 47651621 is about 6903.0153556254. The cubic root of 47651621 is about 362.5427513590.

The spelling of 47651621 in words is "forty-seven million, six hundred fifty-one thousand, six hundred twenty-one".