918131 has 2 divisors, whose sum is σ = 918132. Its totient is φ = 918130.

The previous prime is 918109. The next prime is 918139. The reversal of 918131 is 131819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 918131 - 2⁶ = 918067 is a prime.

It is a super-2 number, since 2×918131² = 1685929066322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 918097 and 918106.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918131.

It is not a weakly prime, because it can be changed into another prime (918139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459065 + 459066.

It is an arithmetic number, because the mean of its divisors is an integer number (459066).

2⁹¹⁸¹³¹ is an apocalyptic number.

918131 is a deficient number, since it is larger than the sum of its proper divisors (1).

918131 is an equidigital number, since it uses as much as digits as its factorization.

918131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 23.

The square root of 918131 is about 958.1915257400. The cubic root of 918131 is about 97.1929767939.

The spelling of 918131 in words is "nine hundred eighteen thousand, one hundred thirty-one".