155455809 has 8 divisors (see below), whose sum is σ = 207659712. Its totient is φ = 103444560.

The previous prime is 155455801. The next prime is 155455813. The reversal of 155455809 is 908554551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155455809 - 2³ = 155455801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155455801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46269 + ... + 49514.

It is an arithmetic number, because the mean of its divisors is an integer number (25957464).

Almost surely, 2^155455809 is an apocalyptic number.

It is an amenable number.

155455809 is a deficient number, since it is larger than the sum of its proper divisors (52203903).

155455809 is an equidigital number, since it uses as much as digits as its factorization.

155455809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96327.

The product of its (nonzero) digits is 180000, while the sum is 42.

The square root of 155455809 is about 12468.1918897649. The cubic root of 155455809 is about 537.6945712743.

The spelling of 155455809 in words is "one hundred fifty-five million, four hundred fifty-five thousand, eight hundred nine".