655012421 has 8 divisors (see below), whose sum is σ = 765994944. Its totient is φ = 548382240.

The previous prime is 655012387. The next prime is 655012439. The reversal of 655012421 is 124210556.

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

It is not a de Polignac number, because 655012421 - 2²⁶ = 587903557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655012021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1087760 + ... + 1088361.

It is an arithmetic number, because the mean of its divisors is an integer number (95749368).

Almost surely, 2^655012421 is an apocalyptic number.

It is an amenable number.

655012421 is a deficient number, since it is larger than the sum of its proper divisors (110982523).

655012421 is a wasteful number, since it uses less digits than its factorization.

655012421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176171.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 655012421 is about 25593.2104473042. The cubic root of 655012421 is about 868.4600498422.

Adding to 655012421 its reverse (124210556), we get a palindrome (779222977).

The spelling of 655012421 in words is "six hundred fifty-five million, twelve thousand, four hundred twenty-one".