135991725 has 12 divisors (see below), whose sum is σ = 224839776. Its totient is φ = 72528880.

The previous prime is 135991703. The next prime is 135991741. The reversal of 135991725 is 527199531.

It is not a de Polignac number, because 135991725 - 2¹⁷ = 135860653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 906537 + ... + 906686.

It is an arithmetic number, because the mean of its divisors is an integer number (18736648).

Almost surely, 2^135991725 is an apocalyptic number.

135991725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135991725 is a deficient number, since it is larger than the sum of its proper divisors (88848051).

135991725 is a wasteful number, since it uses less digits than its factorization.

135991725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813236 (or 1813231 counting only the distinct ones).

The product of its digits is 85050, while the sum is 42.

The square root of 135991725 is about 11661.5489965956. The cubic root of 135991725 is about 514.2458878440.

The spelling of 135991725 in words is "one hundred thirty-five million, nine hundred ninety-one thousand, seven hundred twenty-five".