135468981 has 6 divisors (see below), whose sum is σ = 195677430. Its totient is φ = 90312648.

The previous prime is 135468973. The next prime is 135468989. The reversal of 135468981 is 189864531.

135468981 is a `hidden beast` number, since 13 + 546 + 8 + 98 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (135468973) and next prime (135468989).

It can be written as a sum of positive squares in only one way, i.e., 135349956 + 119025 = 11634^2 + 345^2 .

It is not a de Polignac number, because 135468981 - 2³ = 135468973 is a prime.

It is a super-2 number, since 2×135468981² = 36703689626356722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135468989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7526046 + ... + 7526063.

It is an arithmetic number, because the mean of its divisors is an integer number (32612905).

Almost surely, 2^135468981 is an apocalyptic number.

It is an amenable number.

135468981 is a deficient number, since it is larger than the sum of its proper divisors (60208449).

135468981 is a wasteful number, since it uses less digits than its factorization.

135468981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15052115 (or 15052112 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 135468981 is about 11639.1142704245. The cubic root of 135468981 is about 513.5861316931.

The spelling of 135468981 in words is "one hundred thirty-five million, four hundred sixty-eight thousand, nine hundred eighty-one".