47840861 has 2 divisors, whose sum is σ = 47840862. Its totient is φ = 47840860.

The previous prime is 47840831. The next prime is 47840887. The reversal of 47840861 is 16804874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30360100 + 17480761 = 5510^2 + 4181^2 .

It is a cyclic number.

It is not a de Polignac number, because 47840861 - 2⁶ = 47840797 is a prime.

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 (47840831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23920430 + 23920431.

It is an arithmetic number, because the mean of its divisors is an integer number (23920431).

Almost surely, 2^47840861 is an apocalyptic number.

It is an amenable number.

47840861 is a deficient number, since it is larger than the sum of its proper divisors (1).

47840861 is an equidigital number, since it uses as much as digits as its factorization.

47840861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 47840861 is about 6916.7088271807. The cubic root of 47840861 is about 363.0220422884.

The spelling of 47840861 in words is "forty-seven million, eight hundred forty thousand, eight hundred sixty-one".