865154249 has 2 divisors, whose sum is σ = 865154250. Its totient is φ = 865154248.

The previous prime is 865154237. The next prime is 865154357. The reversal of 865154249 is 942451568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611325625 + 253828624 = 24725^2 + 15932^2 .

It is a cyclic number.

It is not a de Polignac number, because 865154249 - 2⁴ = 865154233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (865154219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432577124 + 432577125.

It is an arithmetic number, because the mean of its divisors is an integer number (432577125).

Almost surely, 2^865154249 is an apocalyptic number.

It is an amenable number.

865154249 is a deficient number, since it is larger than the sum of its proper divisors (1).

865154249 is an equidigital number, since it uses as much as digits as its factorization.

865154249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 44.

The square root of 865154249 is about 29413.5045344821. The cubic root of 865154249 is about 952.8645758004.

The spelling of 865154249 in words is "eight hundred sixty-five million, one hundred fifty-four thousand, two hundred forty-nine".