215134642 has 4 divisors (see below), whose sum is σ = 322701966. Its totient is φ = 107567320.

The previous prime is 215134639. The next prime is 215134649. The reversal of 215134642 is 246431512.

215134642 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.

It can be written as a sum of positive squares in only one way, i.e., 124523281 + 90611361 = 11159^2 + 9519^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215134642.

It is not an unprimeable number, because it can be changed into a prime (215134649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53783659 + ... + 53783662.

Almost surely, 2^215134642 is an apocalyptic number.

215134642 is a deficient number, since it is larger than the sum of its proper divisors (107567324).

215134642 is a wasteful number, since it uses less digits than its factorization.

215134642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107567323.

The product of its digits is 5760, while the sum is 28.

The square root of 215134642 is about 14667.4688341240. The cubic root of 215134642 is about 599.1976701823.

The spelling of 215134642 in words is "two hundred fifteen million, one hundred thirty-four thousand, six hundred forty-two".