215531553439 has 2 divisors, whose sum is σ = 215531553440. Its totient is φ = 215531553438.

The previous prime is 215531553301. The next prime is 215531553463. The reversal of 215531553439 is 934355135512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215531553439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215561553439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107765776719 + 107765776720.

It is an arithmetic number, because the mean of its divisors is an integer number (107765776720).

Almost surely, 2^215531553439 is an apocalyptic number.

215531553439 is a deficient number, since it is larger than the sum of its proper divisors (1).

215531553439 is an equidigital number, since it uses as much as digits as its factorization.

215531553439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1215000, while the sum is 46.

The spelling of 215531553439 in words is "two hundred fifteen billion, five hundred thirty-one million, five hundred fifty-three thousand, four hundred thirty-nine".