47991061 has 2 divisors, whose sum is σ = 47991062. Its totient is φ = 47991060.

The previous prime is 47991037. The next prime is 47991071. The reversal of 47991061 is 16019974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31024900 + 16966161 = 5570^2 + 4119^2 .

It is a cyclic number.

It is not a de Polignac number, because 47991061 - 2¹⁹ = 47466773 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47991061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47991011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23995530 + 23995531.

It is an arithmetic number, because the mean of its divisors is an integer number (23995531).

Almost surely, 2^47991061 is an apocalyptic number.

It is an amenable number.

47991061 is a deficient number, since it is larger than the sum of its proper divisors (1).

47991061 is an equidigital number, since it uses as much as digits as its factorization.

47991061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 47991061 is about 6927.5580834808. The cubic root of 47991061 is about 363.4015571089.

The spelling of 47991061 in words is "forty-seven million, nine hundred ninety-one thousand, sixty-one".