135123931 has 8 divisors (see below), whose sum is σ = 139494960. Its totient is φ = 130808832.

The previous prime is 135123913. The next prime is 135123943. The reversal of 135123931 is 139321531.

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

It is a cyclic number.

It is not a de Polignac number, because 135123931 - 2¹⁷ = 134992859 is a prime.

It is a super-2 number, since 2×135123931² = 36516953457785522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135123931.

It is not an unprimeable number, because it can be changed into a prime (135123971) 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, 9046 + ... + 18763.

It is an arithmetic number, because the mean of its divisors is an integer number (17436870).

Almost surely, 2^135123931 is an apocalyptic number.

135123931 is a deficient number, since it is larger than the sum of its proper divisors (4371029).

135123931 is a wasteful number, since it uses less digits than its factorization.

135123931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27965.

The product of its digits is 2430, while the sum is 28.

The square root of 135123931 is about 11624.2819563189. The cubic root of 135123931 is about 513.1497130507.

The spelling of 135123931 in words is "one hundred thirty-five million, one hundred twenty-three thousand, nine hundred thirty-one".