1918198231 has 2 divisors, whose sum is σ = 1918198232. Its totient is φ = 1918198230.

The previous prime is 1918198201. The next prime is 1918198237. The reversal of 1918198231 is 1328918191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1918198231 - 2⁹ = 1918197719 is a prime.

It is a super-2 number, since 2×1918198231² = 7358968906823058722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918198237) 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 as a sum of consecutive naturals, namely, 959099115 + 959099116.

It is an arithmetic number, because the mean of its divisors is an integer number (959099116).

Almost surely, 2^1918198231 is an apocalyptic number.

1918198231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918198231 is an equidigital number, since it uses as much as digits as its factorization.

1918198231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 43.

The square root of 1918198231 is about 43797.2399929493. The cubic root of 1918198231 is about 1242.5040949250.

The spelling of 1918198231 in words is "one billion, nine hundred eighteen million, one hundred ninety-eight thousand, two hundred thirty-one".