11854171409 has 2 divisors, whose sum is σ = 11854171410. Its totient is φ = 11854171408.

The previous prime is 11854171391. The next prime is 11854171493. The reversal of 11854171409 is 90417145811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6698931409 + 5155240000 = 81847^2 + 71800^2 .

It is a cyclic number.

It is not a de Polignac number, because 11854171409 - 2¹⁶ = 11854105873 is a prime.

It is not a weakly prime, because it can be changed into another prime (11854171709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5927085704 + 5927085705.

It is an arithmetic number, because the mean of its divisors is an integer number (5927085705).

Almost surely, 2^11854171409 is an apocalyptic number.

It is an amenable number.

11854171409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11854171409 is an equidigital number, since it uses as much as digits as its factorization.

11854171409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 41.

The spelling of 11854171409 in words is "eleven billion, eight hundred fifty-four million, one hundred seventy-one thousand, four hundred nine".