655919 has 4 divisors (see below), whose sum is σ = 715560. Its totient is φ = 596280.

The previous prime is 655913. The next prime is 655927. The reversal of 655919 is 919556.

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 655919 - 2¹⁶ = 590383 is a prime.

It is a super-2 number, since 2×655919² = 860459469122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655919.

It is not an unprimeable number, because it can be changed into a prime (655913) 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, 29804 + ... + 29825.

It is an arithmetic number, because the mean of its divisors is an integer number (178890).

2⁶⁵⁵⁹¹⁹ is an apocalyptic number.

655919 is a deficient number, since it is larger than the sum of its proper divisors (59641).

655919 is a wasteful number, since it uses less digits than its factorization.

655919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59640.

The product of its digits is 12150, while the sum is 35.

The square root of 655919 is about 809.8882638982. Note that the first 3 decimals coincide. The cubic root of 655919 is about 86.8860533182.

The spelling of 655919 in words is "six hundred fifty-five thousand, nine hundred nineteen".