215541354131 has 4 divisors (see below), whose sum is σ = 215826085872. Its totient is φ = 215256622392.

The previous prime is 215541354121. The next prime is 215541354137. The reversal of 215541354131 is 131453145512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215541354131 is a prime.

It is a super-2 number, since 2×215541354131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215541354091 and 215541354100.

It is not an unprimeable number, because it can be changed into a prime (215541354137) 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 3 ways as a sum of consecutive naturals, for example, 142364735 + ... + 142366248.

It is an arithmetic number, because the mean of its divisors is an integer number (53956521468).

Almost surely, 2^215541354131 is an apocalyptic number.

215541354131 is a deficient number, since it is larger than the sum of its proper divisors (284731741).

215541354131 is an equidigital number, since it uses as much as digits as its factorization.

215541354131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284731740.

The product of its digits is 36000, while the sum is 35.

Adding to 215541354131 its reverse (131453145512), we get a palindrome (346994499643).

The spelling of 215541354131 in words is "two hundred fifteen billion, five hundred forty-one million, three hundred fifty-four thousand, one hundred thirty-one".