87947449 has 2 divisors, whose sum is σ = 87947450. Its totient is φ = 87947448.

The previous prime is 87947441. The next prime is 87947521. The reversal of 87947449 is 94474978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86359849 + 1587600 = 9293^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 87947449 - 2³ = 87947441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87947396 and 87947405.

It is not a weakly prime, because it can be changed into another prime (87947441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43973724 + 43973725.

It is an arithmetic number, because the mean of its divisors is an integer number (43973725).

Almost surely, 2^87947449 is an apocalyptic number.

It is an amenable number.

87947449 is a deficient number, since it is larger than the sum of its proper divisors (1).

87947449 is an equidigital number, since it uses as much as digits as its factorization.

87947449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The square root of 87947449 is about 9378.0301236454. The cubic root of 87947449 is about 444.7074608035.

The spelling of 87947449 in words is "eighty-seven million, nine hundred forty-seven thousand, four hundred forty-nine".