191222542507 has 2 divisors, whose sum is σ = 191222542508. Its totient is φ = 191222542506.

The previous prime is 191222542499. The next prime is 191222542523. The reversal of 191222542507 is 705245222191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191222542507 - 2³ = 191222542499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191222542507.

It is not a weakly prime, because it can be changed into another prime (191222542597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95611271253 + 95611271254.

It is an arithmetic number, because the mean of its divisors is an integer number (95611271254).

Almost surely, 2^191222542507 is an apocalyptic number.

191222542507 is a deficient number, since it is larger than the sum of its proper divisors (1).

191222542507 is an equidigital number, since it uses as much as digits as its factorization.

191222542507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 40.

Adding to 191222542507 its reverse (705245222191), we get a palindrome (896467764698).

The spelling of 191222542507 in words is "one hundred ninety-one billion, two hundred twenty-two million, five hundred forty-two thousand, five hundred seven".