215142461 has 4 divisors (see below), whose sum is σ = 218089692. Its totient is φ = 212195232.

The previous prime is 215142451. The next prime is 215142481. The reversal of 215142461 is 164241512.

215142461 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 2 ways, for example, as 44970436 + 170172025 = 6706^2 + 13045^2 .

It is not a de Polignac number, because 215142461 - 2⁶ = 215142397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 215142461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215142401) 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, 1473506 + ... + 1473651.

It is an arithmetic number, because the mean of its divisors is an integer number (54522423).

Almost surely, 2^215142461 is an apocalyptic number.

It is an amenable number.

215142461 is a deficient number, since it is larger than the sum of its proper divisors (2947231).

215142461 is an equidigital number, since it uses as much as digits as its factorization.

215142461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947230.

The product of its digits is 1920, while the sum is 26.

The square root of 215142461 is about 14667.7353739424. The cubic root of 215142461 is about 599.2049293104.

Adding to 215142461 its reverse (164241512), we get a palindrome (379383973).

The spelling of 215142461 in words is "two hundred fifteen million, one hundred forty-two thousand, four hundred sixty-one".