135525991 has 2 divisors, whose sum is σ = 135525992. Its totient is φ = 135525990.

The previous prime is 135525983. The next prime is 135526003. The reversal of 135525991 is 199525531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135525991 - 2³ = 135525983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135525911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67762995 + 67762996.

It is an arithmetic number, because the mean of its divisors is an integer number (67762996).

Almost surely, 2^135525991 is an apocalyptic number.

135525991 is a deficient number, since it is larger than the sum of its proper divisors (1).

135525991 is an equidigital number, since it uses as much as digits as its factorization.

135525991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60750, while the sum is 40.

The square root of 135525991 is about 11641.5630823356. The cubic root of 135525991 is about 513.6581664837.

The spelling of 135525991 in words is "one hundred thirty-five million, five hundred twenty-five thousand, nine hundred ninety-one".