1831995493 has 4 divisors (see below), whose sum is σ = 1862028268. Its totient is φ = 1801962720.

The previous prime is 1831995461. The next prime is 1831995533. The reversal of 1831995493 is 3945991381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3945991381 = 55117 ⋅71593.

It can be written as a sum of positive squares in 2 ways, for example, as 276324129 + 1555671364 = 16623^2 + 39442^2 .

It is a cyclic number.

It is not a de Polignac number, because 1831995493 - 2⁵ = 1831995461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1831995493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1831995413) 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 3 ways as a sum of consecutive naturals, for example, 15016296 + ... + 15016417.

It is an arithmetic number, because the mean of its divisors is an integer number (465507067).

Almost surely, 2^1831995493 is an apocalyptic number.

It is an amenable number.

1831995493 is a deficient number, since it is larger than the sum of its proper divisors (30032775).

1831995493 is an equidigital number, since it uses as much as digits as its factorization.

1831995493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30032774.

The product of its digits is 1049760, while the sum is 52.

The square root of 1831995493 is about 42801.8164684631. The cubic root of 1831995493 is about 1223.6056311067.

The spelling of 1831995493 in words is "one billion, eight hundred thirty-one million, nine hundred ninety-five thousand, four hundred ninety-three".