215541442 has 8 divisors (see below), whose sum is σ = 326334096. Its totient is φ = 106763412.

The previous prime is 215541437. The next prime is 215541449. The reversal of 215541442 is 244145512.

215541442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×215541442² = 92916226438878728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215541442.

It is not an unprimeable number, because it can be changed into a prime (215541449) 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, 503388 + ... + 503815.

It is an arithmetic number, because the mean of its divisors is an integer number (40791762).

Almost surely, 2^215541442 is an apocalyptic number.

215541442 is a deficient number, since it is larger than the sum of its proper divisors (110792654).

215541442 is a wasteful number, since it uses less digits than its factorization.

215541442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007312.

The product of its digits is 6400, while the sum is 28.

The square root of 215541442 is about 14681.3297081702. The cubic root of 215541442 is about 599.5751084422.

Adding to 215541442 its reverse (244145512), we get a palindrome (459686954).

The spelling of 215541442 in words is "two hundred fifteen million, five hundred forty-one thousand, four hundred forty-two".