215251313461 has 8 divisors (see below), whose sum is σ = 219801130200. Its totient is φ = 210719588352.

The previous prime is 215251313399. The next prime is 215251313471. The reversal of 215251313461 is 164313152512.

It can be written as a sum of positive squares in 4 ways, for example, as 22262430436 + 192988883025 = 149206^2 + 439305^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 215251313461 - 2²¹ = 215249216309 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 (215251313471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4498860 + ... + 4546453.

It is an arithmetic number, because the mean of its divisors is an integer number (27475141275).

Almost surely, 2^215251313461 is an apocalyptic number.

It is an amenable number.

215251313461 is a deficient number, since it is larger than the sum of its proper divisors (4549816739).

215251313461 is an equidigital number, since it uses as much as digits as its factorization.

215251313461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9045815.

The product of its digits is 21600, while the sum is 34.

Adding to 215251313461 its reverse (164313152512), we get a palindrome (379564465973).

The spelling of 215251313461 in words is "two hundred fifteen billion, two hundred fifty-one million, three hundred thirteen thousand, four hundred sixty-one".