87139049 has 8 divisors (see below), whose sum is σ = 90241992. Its totient is φ = 84090240.

The previous prime is 87139037. The next prime is 87139051. The reversal of 87139049 is 94093178.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7661824 + 79477225 = 2768^2 + 8915^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87139049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 87138997 and 87139015.

It is not an unprimeable number, because it can be changed into a prime (87139009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10244 + ... + 16709.

It is an arithmetic number, because the mean of its divisors is an integer number (11280249).

Almost surely, 2^87139049 is an apocalyptic number.

It is an amenable number.

87139049 is a deficient number, since it is larger than the sum of its proper divisors (3102943).

87139049 is a wasteful number, since it uses less digits than its factorization.

87139049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27067.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 87139049 is about 9334.8298859701. The cubic root of 87139049 is about 443.3407026997.

The spelling of 87139049 in words is "eighty-seven million, one hundred thirty-nine thousand, forty-nine".