8190687493 has 4 divisors (see below), whose sum is σ = 8245658700. Its totient is φ = 8135716288.

The previous prime is 8190687487. The next prime is 8190687497. The reversal of 8190687493 is 3947860918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3947860918 = 2 ⋅1973930459.

It can be written as a sum of positive squares in 2 ways, for example, as 270043489 + 7920644004 = 16433^2 + 88998^2 .

It is a cyclic number.

It is not a de Polignac number, because 8190687493 - 2¹⁷ = 8190556421 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 (8190687497) 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, 27485380 + ... + 27485677.

It is an arithmetic number, because the mean of its divisors is an integer number (2061414675).

Almost surely, 2^8190687493 is an apocalyptic number.

It is an amenable number.

8190687493 is a deficient number, since it is larger than the sum of its proper divisors (54971207).

8190687493 is a wasteful number, since it uses less digits than its factorization.

8190687493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54971206.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 8190687493 is about 90502.4170561207. The cubic root of 8190687493 is about 2015.7660142380.

The spelling of 8190687493 in words is "eight billion, one hundred ninety million, six hundred eighty-seven thousand, four hundred ninety-three".