918139 has 2 divisors, whose sum is σ = 918140. Its totient is φ = 918138.

The previous prime is 918131. The next prime is 918143. The reversal of 918139 is 931819.

918139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 918139 - 2³ = 918131 is a prime.

It is equal to p₇₂₅₉₈ and since 918139 and 72598 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 918139.

It is not a weakly prime, because it can be changed into another prime (918131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459069 + 459070.

It is an arithmetic number, because the mean of its divisors is an integer number (459070).

2⁹¹⁸¹³⁹ is an apocalyptic number.

918139 is a deficient number, since it is larger than the sum of its proper divisors (1).

918139 is an equidigital number, since it uses as much as digits as its factorization.

918139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 918139 is about 958.1957002617. The cubic root of 918139 is about 97.1932590853.

The spelling of 918139 in words is "nine hundred eighteen thousand, one hundred thirty-nine".