215465401 has 4 divisors (see below), whose sum is σ = 216559332. Its totient is φ = 214371472.

The previous prime is 215465399. The next prime is 215465441. The reversal of 215465401 is 104564512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93141801 + 122323600 = 9651^2 + 11060^2 .

It is a cyclic number.

It is not a de Polignac number, because 215465401 - 2¹ = 215465399 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 215465401.

It is not an unprimeable number, because it can be changed into a prime (215465441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546670 + ... + 547063.

It is an arithmetic number, because the mean of its divisors is an integer number (54139833).

Almost surely, 2^215465401 is an apocalyptic number.

It is an amenable number.

215465401 is a deficient number, since it is larger than the sum of its proper divisors (1093931).

215465401 is a wasteful number, since it uses less digits than its factorization.

215465401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093930.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 215465401 is about 14678.7397619823. The cubic root of 215465401 is about 599.5045919900.

The spelling of 215465401 in words is "two hundred fifteen million, four hundred sixty-five thousand, four hundred one".