215040541 has 4 divisors (see below), whose sum is σ = 217013500. Its totient is φ = 213067584.

The previous prime is 215040533. The next prime is 215040569. The reversal of 215040541 is 145040512.

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 179292100 + 35748441 = 13390^2 + 5979^2 .

It is a cyclic number.

It is not a de Polignac number, because 215040541 - 2³ = 215040533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215047541) 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, 986316 + ... + 986533.

It is an arithmetic number, because the mean of its divisors is an integer number (54253375).

Almost surely, 2^215040541 is an apocalyptic number.

It is an amenable number.

215040541 is a deficient number, since it is larger than the sum of its proper divisors (1972959).

215040541 is a wasteful number, since it uses less digits than its factorization.

215040541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972958.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 215040541 is about 14664.2606700781. The cubic root of 215040541 is about 599.1102933927.

The spelling of 215040541 in words is "two hundred fifteen million, forty thousand, five hundred forty-one".