87654421949 has 4 divisors (see below), whose sum is σ = 87747573180. Its totient is φ = 87561270720.

The previous prime is 87654421931. The next prime is 87654421993. The reversal of 87654421949 is 94912445678.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94912445678 = 2 ⋅47456222839.

It can be written as a sum of positive squares in 2 ways, for example, as 51339402724 + 36315019225 = 226582^2 + 190565^2 .

It is a cyclic number.

It is not a de Polignac number, because 87654421949 - 2³⁶ = 18934945213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87654421909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46574204 + ... + 46576085.

It is an arithmetic number, because the mean of its divisors is an integer number (21936893295).

Almost surely, 2^87654421949 is an apocalyptic number.

It is an amenable number.

87654421949 is a deficient number, since it is larger than the sum of its proper divisors (93151231).

87654421949 is an equidigital number, since it uses as much as digits as its factorization.

87654421949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93151230.

The product of its digits is 17418240, while the sum is 59.

The spelling of 87654421949 in words is "eighty-seven billion, six hundred fifty-four million, four hundred twenty-one thousand, nine hundred forty-nine".