135551540 has 24 divisors (see below), whose sum is σ = 301403592. Its totient is φ = 51031040.

The previous prime is 135551513. The next prime is 135551543. The reversal of 135551540 is 45155531.

It can be written as a sum of positive squares in 4 ways, for example, as 2748964 + 132802576 = 1658^2 + 11524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135551543) 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, 199001 + ... + 199680.

It is an arithmetic number, because the mean of its divisors is an integer number (12558483).

Almost surely, 2^135551540 is an apocalyptic number.

135551540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135551540 is an abundant number, since it is smaller than the sum of its proper divisors (165852052).

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

135551540 is a wasteful number, since it uses less digits than its factorization.

135551540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398707 (or 398705 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 135551540 is about 11642.6603489065. The cubic root of 135551540 is about 513.6904422802.

The spelling of 135551540 in words is "one hundred thirty-five million, five hundred fifty-one thousand, five hundred forty".