1918131 has 8 divisors (see below), whose sum is σ = 2668800. Its totient is φ = 1223112.

The previous prime is 1918129. The next prime is 1918151. The reversal of 1918131 is 1318191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1918131 - 2¹ = 1918129 is a prime.

It is a super-2 number, since 2×1918131² = 7358453066322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1918121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13831 + ... + 13968.

It is an arithmetic number, because the mean of its divisors is an integer number (333600).

2^1918131 is an apocalyptic number.

1918131 is a deficient number, since it is larger than the sum of its proper divisors (750669).

1918131 is a wasteful number, since it uses less digits than its factorization.

1918131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27825.

The product of its digits is 216, while the sum is 24.

The square root of 1918131 is about 1384.9660645662. The cubic root of 1918131 is about 124.2489578565.

The spelling of 1918131 in words is "one million, nine hundred eighteen thousand, one hundred thirty-one".