655582991 has 8 divisors (see below), whose sum is σ = 749933184. Its totient is φ = 561406680.

The previous prime is 655582957. The next prime is 655583003. The reversal of 655582991 is 199285556.

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

It is a cyclic number.

It is not a de Polignac number, because 655582991 - 2²⁶ = 588474127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655582691) 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, 35285 + ... + 50558.

It is an arithmetic number, because the mean of its divisors is an integer number (93741648).

Almost surely, 2^655582991 is an apocalyptic number.

655582991 is a deficient number, since it is larger than the sum of its proper divisors (94350193).

655582991 is a wasteful number, since it uses less digits than its factorization.

655582991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86941.

The product of its digits is 972000, while the sum is 50.

The square root of 655582991 is about 25604.3549225517. The cubic root of 655582991 is about 868.7121435051.

The spelling of 655582991 in words is "six hundred fifty-five million, five hundred eighty-two thousand, nine hundred ninety-one".