135871901 has 4 divisors (see below), whose sum is σ = 148223904. Its totient is φ = 123519900.

The previous prime is 135871891. The next prime is 135871903. The reversal of 135871901 is 109178531.

135871901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135871901 - 2¹⁰ = 135870877 is a prime.

It is a super-2 number, since 2×135871901² = 36922346962707602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135871903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6175985 + ... + 6176006.

It is an arithmetic number, because the mean of its divisors is an integer number (37055976).

Almost surely, 2^135871901 is an apocalyptic number.

135871901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135871901 is a deficient number, since it is larger than the sum of its proper divisors (12352003).

135871901 is a wasteful number, since it uses less digits than its factorization.

135871901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12352002.

The product of its (nonzero) digits is 7560, while the sum is 35.

The square root of 135871901 is about 11656.4102964849. The cubic root of 135871901 is about 514.0948073135.

The spelling of 135871901 in words is "one hundred thirty-five million, eight hundred seventy-one thousand, nine hundred one".