869540117 has 2 divisors, whose sum is σ = 869540118. Its totient is φ = 869540116.

The previous prime is 869540099. The next prime is 869540129. The reversal of 869540117 is 711045968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 779023921 + 90516196 = 27911^2 + 9514^2 .

It is a cyclic number.

It is not a de Polignac number, because 869540117 - 2⁸ = 869539861 is a prime.

It is a super-2 number, since 2×869540117² = 1512200030144747378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869540167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434770058 + 434770059.

It is an arithmetic number, because the mean of its divisors is an integer number (434770059).

Almost surely, 2^869540117 is an apocalyptic number.

It is an amenable number.

869540117 is a deficient number, since it is larger than the sum of its proper divisors (1).

869540117 is an equidigital number, since it uses as much as digits as its factorization.

869540117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 869540117 is about 29487.9656300668. The cubic root of 869540117 is about 954.4720333075.

The spelling of 869540117 in words is "eight hundred sixty-nine million, five hundred forty thousand, one hundred seventeen".