855372409 has 2 divisors, whose sum is σ = 855372410. Its totient is φ = 855372408.

The previous prime is 855372403. The next prime is 855372431. The reversal of 855372409 is 904273558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 852640000 + 2732409 = 29200^2 + 1653^2 .

It is a cyclic number.

It is not a de Polignac number, because 855372409 - 2⁷ = 855372281 is a prime.

It is not a weakly prime, because it can be changed into another prime (855372403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427686204 + 427686205.

It is an arithmetic number, because the mean of its divisors is an integer number (427686205).

Almost surely, 2^855372409 is an apocalyptic number.

It is an amenable number.

855372409 is a deficient number, since it is larger than the sum of its proper divisors (1).

855372409 is an equidigital number, since it uses as much as digits as its factorization.

855372409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 855372409 is about 29246.7504006855. The cubic root of 855372409 is about 949.2597775835.

The spelling of 855372409 in words is "eight hundred fifty-five million, three hundred seventy-two thousand, four hundred nine".