542115991 has 2 divisors, whose sum is σ = 542115992. Its totient is φ = 542115990.

The previous prime is 542115989. The next prime is 542116073. The reversal of 542115991 is 199511245.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 542115991 - 2¹ = 542115989 is a prime.

Together with 542115989, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 542115991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542110991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271057995 + 271057996.

It is an arithmetic number, because the mean of its divisors is an integer number (271057996).

Almost surely, 2^542115991 is an apocalyptic number.

542115991 is a deficient number, since it is larger than the sum of its proper divisors (1).

542115991 is an equidigital number, since it uses as much as digits as its factorization.

542115991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 37.

The square root of 542115991 is about 23283.3844404116. The cubic root of 542115991 is about 815.3875437424.

It can be divided in two parts, 5421 and 15991, that added together give a palindrome (21412).

The spelling of 542115991 in words is "five hundred forty-two million, one hundred fifteen thousand, nine hundred ninety-one".