135561942 has 24 divisors (see below), whose sum is σ = 294025680. Its totient is φ = 45139920.

The previous prime is 135561913. The next prime is 135561953. The reversal of 135561942 is 249165531.

135561942 is a `hidden beast` number, since 1 + 3 + 5 + 561 + 94 + 2 = 666.

It is a super-2 number, since 2×135561942² = 36754080237622728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 135561897 and 135561906.

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, 16567 + ... + 23357.

It is an arithmetic number, because the mean of its divisors is an integer number (12251070).

Almost surely, 2^135561942 is an apocalyptic number.

135561942 is an abundant number, since it is smaller than the sum of its proper divisors (158463738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135561942 is a wasteful number, since it uses less digits than its factorization.

135561942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7908 (or 7905 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 135561942 is about 11643.1070595439. The cubic root of 135561942 is about 513.7035818612.

It can be divided in two parts, 135561 and 942, that added together give a triangular number (136503 = T₅₂₂).

The spelling of 135561942 in words is "one hundred thirty-five million, five hundred sixty-one thousand, nine hundred forty-two".