256621103 has 8 divisors (see below), whose sum is σ = 274408560. Its totient is φ = 239132800.

The previous prime is 256621093. The next prime is 256621111. The reversal of 256621103 is 301126652.

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 256621103 - 2¹² = 256617007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256621303) 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, 73013 + ... + 76446.

It is an arithmetic number, because the mean of its divisors is an integer number (34301070).

Almost surely, 2^256621103 is an apocalyptic number.

256621103 is a deficient number, since it is larger than the sum of its proper divisors (17787457).

256621103 is a wasteful number, since it uses less digits than its factorization.

256621103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149577.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 256621103 is about 16019.3977102761. The cubic root of 256621103 is about 635.4735162413.

Adding to 256621103 its reverse (301126652), we get a palindrome (557747755).

The spelling of 256621103 in words is "two hundred fifty-six million, six hundred twenty-one thousand, one hundred three".