1918162493 has 4 divisors (see below), whose sum is σ = 2065713468. Its totient is φ = 1770611520.

The previous prime is 1918162469. The next prime is 1918162529. The reversal of 1918162493 is 3942618191.

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

It can be written as a sum of positive squares in 2 ways, for example, as 367220569 + 1550941924 = 19163^2 + 39382^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918162493 - 2²⁶ = 1851053629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918162403) 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, 73775468 + ... + 73775493.

It is an arithmetic number, because the mean of its divisors is an integer number (516428367).

Almost surely, 2^1918162493 is an apocalyptic number.

1918162493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1918162493 is a deficient number, since it is larger than the sum of its proper divisors (147550975).

1918162493 is a wasteful number, since it uses less digits than its factorization.

1918162493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147550974.

The product of its digits is 93312, while the sum is 44.

The square root of 1918162493 is about 43796.8319973032. The cubic root of 1918162493 is about 1242.4963785020.

The spelling of 1918162493 in words is "one billion, nine hundred eighteen million, one hundred sixty-two thousand, four hundred ninety-three".