215401 has 4 divisors (see below), whose sum is σ = 220032. Its totient is φ = 210772.

The previous prime is 215399. The next prime is 215417. The reversal of 215401 is 104512.

215401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215401 - 2¹ = 215399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215461) 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, 2245 + ... + 2338.

It is an arithmetic number, because the mean of its divisors is an integer number (55008).

2²¹⁵⁴⁰¹ is an apocalyptic number.

It is an amenable number.

215401 is a deficient number, since it is larger than the sum of its proper divisors (4631).

215401 is an equidigital number, since it uses as much as digits as its factorization.

215401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 215401 is about 464.1131327597. The cubic root of 215401 is about 59.9444856889.

Adding to 215401 its reverse (104512), we get a palindrome (319913).

Subtracting from 215401 its reverse (104512), we obtain a square (110889 = 333²).

It can be divided in two parts, 215 and 401, that added together give a palindrome (616).

The spelling of 215401 in words is "two hundred fifteen thousand, four hundred one".