47187661 has 2 divisors, whose sum is σ = 47187662. Its totient is φ = 47187660.

The previous prime is 47187629. The next prime is 47187667. The reversal of 47187661 is 16678174.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46498761 + 688900 = 6819^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 47187661 - 2⁵ = 47187629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47187667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23593830 + 23593831.

It is an arithmetic number, because the mean of its divisors is an integer number (23593831).

Almost surely, 2^47187661 is an apocalyptic number.

It is an amenable number.

47187661 is a deficient number, since it is larger than the sum of its proper divisors (1).

47187661 is an equidigital number, since it uses as much as digits as its factorization.

47187661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 47187661 is about 6869.3275507869. The cubic root of 47187661 is about 361.3622793274.

The spelling of 47187661 in words is "forty-seven million, one hundred eighty-seven thousand, six hundred sixty-one".