215543651431 has 2 divisors, whose sum is σ = 215543651432. Its totient is φ = 215543651430.

The previous prime is 215543651371. The next prime is 215543651489. The reversal of 215543651431 is 134156345512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215543651431 - 2⁷ = 215543651303 is a prime.

It is a super-2 number, since 2×215543651431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215543651731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107771825715 + 107771825716.

It is an arithmetic number, because the mean of its divisors is an integer number (107771825716).

Almost surely, 2^215543651431 is an apocalyptic number.

215543651431 is a deficient number, since it is larger than the sum of its proper divisors (1).

215543651431 is an equidigital number, since it uses as much as digits as its factorization.

215543651431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 40.

Adding to 215543651431 its reverse (134156345512), we get a palindrome (349699996943).

The spelling of 215543651431 in words is "two hundred fifteen billion, five hundred forty-three million, six hundred fifty-one thousand, four hundred thirty-one".