135021731 has 8 divisors (see below), whose sum is σ = 147792624. Its totient is φ = 122591520.

The previous prime is 135021703. The next prime is 135021737. The reversal of 135021731 is 137120531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135021731 is a prime.

It is a super-2 number, since 2×135021731² = 36461735684472722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135021697 and 135021706.

It is not an unprimeable number, because it can be changed into a prime (135021737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84341 + ... + 85926.

It is an arithmetic number, because the mean of its divisors is an integer number (18474078).

Almost surely, 2^135021731 is an apocalyptic number.

135021731 is a deficient number, since it is larger than the sum of its proper divisors (12770893).

135021731 is a wasteful number, since it uses less digits than its factorization.

135021731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170341.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 135021731 is about 11619.8851543378. The cubic root of 135021731 is about 513.0203080724.

The spelling of 135021731 in words is "one hundred thirty-five million, twenty-one thousand, seven hundred thirty-one".