215431061 has 8 divisors (see below), whose sum is σ = 219784320. Its totient is φ = 211088592.

The previous prime is 215431043. The next prime is 215431067. The reversal of 215431061 is 160134512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215431061 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 (215431067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46496 + ... + 50918.

It is an arithmetic number, because the mean of its divisors is an integer number (27473040).

Almost surely, 2^215431061 is an apocalyptic number.

It is an amenable number.

215431061 is a deficient number, since it is larger than the sum of its proper divisors (4353259).

215431061 is an equidigital number, since it uses as much as digits as its factorization.

215431061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5395.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 215431061 is about 14677.5699964265. The cubic root of 215431061 is about 599.4727414294.

Adding to 215431061 its reverse (160134512), we get a palindrome (375565573).

The spelling of 215431061 in words is "two hundred fifteen million, four hundred thirty-one thousand, sixty-one".