655402123 has 4 divisors (see below), whose sum is σ = 655484368. Its totient is φ = 655319880.

The previous prime is 655402079. The next prime is 655402133. The reversal of 655402123 is 321204556.

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 655402123 - 2¹³ = 655393931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 655402091 and 655402100.

It is not an unprimeable number, because it can be changed into a prime (655402133) 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, 27711 + ... + 45592.

It is an arithmetic number, because the mean of its divisors is an integer number (163871092).

Almost surely, 2^655402123 is an apocalyptic number.

655402123 is a deficient number, since it is larger than the sum of its proper divisors (82245).

655402123 is an equidigital number, since it uses as much as digits as its factorization.

655402123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82244.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 655402123 is about 25600.8227016243. The cubic root of 655402123 is about 868.6322468422.

Adding to 655402123 its reverse (321204556), we get a palindrome (976606679).

The spelling of 655402123 in words is "six hundred fifty-five million, four hundred two thousand, one hundred twenty-three".