87561449 has 2 divisors, whose sum is σ = 87561450. Its totient is φ = 87561448.

The previous prime is 87561403. The next prime is 87561451. The reversal of 87561449 is 94416578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44462224 + 43099225 = 6668^2 + 6565^2 .

It is a cyclic number.

It is not a de Polignac number, because 87561449 - 2²⁰ = 86512873 is a prime.

Together with 87561451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87561349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43780724 + 43780725.

It is an arithmetic number, because the mean of its divisors is an integer number (43780725).

Almost surely, 2^87561449 is an apocalyptic number.

It is an amenable number.

87561449 is a deficient number, since it is larger than the sum of its proper divisors (1).

87561449 is an equidigital number, since it uses as much as digits as its factorization.

87561449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 87561449 is about 9357.4274776778. The cubic root of 87561449 is about 444.0559019109.

The spelling of 87561449 in words is "eighty-seven million, five hundred sixty-one thousand, four hundred forty-nine".