102401555 has 8 divisors (see below), whose sum is σ = 123213552. Its totient is φ = 81700128.

The previous prime is 102401549. The next prime is 102401567. The reversal of 102401555 is 555104201.

It is a happy number.

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 102401555 - 2⁴ = 102401539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102401555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25589 + ... + 29318.

It is an arithmetic number, because the mean of its divisors is an integer number (15401694).

Almost surely, 2^102401555 is an apocalyptic number.

102401555 is a deficient number, since it is larger than the sum of its proper divisors (20811997).

102401555 is an equidigital number, since it uses as much as digits as its factorization.

102401555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55285.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 102401555 is about 10119.3653457122. The cubic root of 102401555 is about 467.8452062519.

Adding to 102401555 its reverse (555104201), we get a palindrome (657505756).

The spelling of 102401555 in words is "one hundred two million, four hundred one thousand, five hundred fifty-five".