87819449 has 2 divisors, whose sum is σ = 87819450. Its totient is φ = 87819448.

The previous prime is 87819437. The next prime is 87819491. The reversal of 87819449 is 94491878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87759424 + 60025 = 9368^2 + 245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87819449 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 87819397 and 87819406.

It is not a weakly prime, because it can be changed into another prime (87819409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43909724 + 43909725.

It is an arithmetic number, because the mean of its divisors is an integer number (43909725).

Almost surely, 2^87819449 is an apocalyptic number.

It is an amenable number.

87819449 is a deficient number, since it is larger than the sum of its proper divisors (1).

87819449 is an equidigital number, since it uses as much as digits as its factorization.

87819449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 87819449 is about 9371.2031778209. The cubic root of 87819449 is about 444.4916114780.

The spelling of 87819449 in words is "eighty-seven million, eight hundred nineteen thousand, four hundred forty-nine".