215253541 has 4 divisors (see below), whose sum is σ = 227915532. Its totient is φ = 202591552.

The previous prime is 215253529. The next prime is 215253551. The reversal of 215253541 is 145352512.

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 177688900 + 37564641 = 13330^2 + 6129^2 .

It is a cyclic number.

It is not a de Polignac number, because 215253541 - 2⁵ = 215253509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215253551) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6330970 + ... + 6331003.

It is an arithmetic number, because the mean of its divisors is an integer number (56978883).

Almost surely, 2^215253541 is an apocalyptic number.

It is an amenable number.

215253541 is a deficient number, since it is larger than the sum of its proper divisors (12661991).

215253541 is a wasteful number, since it uses less digits than its factorization.

215253541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12661990.

The product of its digits is 6000, while the sum is 28.

The square root of 215253541 is about 14671.5214275821. The cubic root of 215253541 is about 599.3080365437.

The spelling of 215253541 in words is "two hundred fifteen million, two hundred fifty-three thousand, five hundred forty-one".