655503091 has 4 divisors (see below), whose sum is σ = 676648384.
Its totient is φ = 634357800.
The previous prime is 655503089. The next prime is 655503179. The reversal of 655503091 is 190305556.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 655503091 - 21 = 655503089 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (655503491) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10572600 + ... + 10572661.
It is an arithmetic number, because the mean of its divisors is an integer number (169162096).
Almost surely, 2655503091 is an apocalyptic number.
655503091 is a deficient number, since it is larger than the sum of its proper divisors (21145293).
655503091 is a wasteful number, since it uses less digits than its factorization.
655503091 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 21145292.
The product of its (nonzero) digits is 20250, while the sum is 34.
The square root of 655503091 is about 25602.7945935595.
The cubic root of 655503091 is about 868.6768502769.
The spelling of 655503091 in words is "six hundred fifty-five million, five hundred three thousand, ninety-one".