47921117 has 2 divisors, whose sum is σ = 47921118. Its totient is φ = 47921116.

The previous prime is 47921099. The next prime is 47921119. The reversal of 47921117 is 71112974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45010681 + 2910436 = 6709^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 47921117 - 2⁶ = 47921053 is a prime.

Together with 47921119, 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 (47921119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23960558 + 23960559.

It is an arithmetic number, because the mean of its divisors is an integer number (23960559).

Almost surely, 2^47921117 is an apocalyptic number.

It is an amenable number.

47921117 is a deficient number, since it is larger than the sum of its proper divisors (1).

47921117 is an equidigital number, since it uses as much as digits as its factorization.

47921117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 32.

The square root of 47921117 is about 6922.5079992731. The cubic root of 47921117 is about 363.2249261818.

The spelling of 47921117 in words is "forty-seven million, nine hundred twenty-one thousand, one hundred seventeen".