655237421 has 16 divisors (see below), whose sum is σ = 698234880. Its totient is φ = 613934640.

The previous prime is 655237369. The next prime is 655237423. The reversal of 655237421 is 124732556.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655237421 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 (655237423) 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 15 ways as a sum of consecutive naturals, for example, 119870 + ... + 125216.

It is an arithmetic number, because the mean of its divisors is an integer number (43639680).

Almost surely, 2^655237421 is an apocalyptic number.

It is an amenable number.

655237421 is a deficient number, since it is larger than the sum of its proper divisors (42997459).

655237421 is a wasteful number, since it uses less digits than its factorization.

655237421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5504.

The product of its digits is 50400, while the sum is 35.

The square root of 655237421 is about 25597.6057669463. The cubic root of 655237421 is about 868.5594785630.

Adding to 655237421 its reverse (124732556), we get a palindrome (779969977).

The spelling of 655237421 in words is "six hundred fifty-five million, two hundred thirty-seven thousand, four hundred twenty-one".