135054991 has 2 divisors, whose sum is σ = 135054992. Its totient is φ = 135054990.

The previous prime is 135054989. The next prime is 135055009. The reversal of 135054991 is 199450531.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135054991 - 2¹ = 135054989 is a prime.

Together with 135054989, it forms a pair of twin primes.

It is equal to p_7648417 and since 135054991 and 7648417 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135054991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135054901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67527495 + 67527496.

It is an arithmetic number, because the mean of its divisors is an integer number (67527496).

Almost surely, 2^135054991 is an apocalyptic number.

135054991 is a deficient number, since it is larger than the sum of its proper divisors (1).

135054991 is an equidigital number, since it uses as much as digits as its factorization.

135054991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 135054991 is about 11621.3162335426. The cubic root of 135054991 is about 513.0624288343.

It can be divided in two parts, 13505 and 4991, that added together give a square (18496 = 136²).

The spelling of 135054991 in words is "one hundred thirty-five million, fifty-four thousand, nine hundred ninety-one".