87782131 has 4 divisors (see below), whose sum is σ = 88099312. Its totient is φ = 87464952.

The previous prime is 87782089. The next prime is 87782153. The reversal of 87782131 is 13128778.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87782131 - 2¹¹ = 87780083 is a prime.

It is a super-2 number, since 2×87782131² = 15411405045802322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87782171) 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 in 3 ways as a sum of consecutive naturals, for example, 158175 + ... + 158728.

It is an arithmetic number, because the mean of its divisors is an integer number (22024828).

Almost surely, 2^87782131 is an apocalyptic number.

87782131 is a deficient number, since it is larger than the sum of its proper divisors (317181).

87782131 is a wasteful number, since it uses less digits than its factorization.

87782131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317180.

The product of its digits is 18816, while the sum is 37.

The square root of 87782131 is about 9369.2118665339. The cubic root of 87782131 is about 444.4286417969.

The spelling of 87782131 in words is "eighty-seven million, seven hundred eighty-two thousand, one hundred thirty-one".