135744400531 has 4 divisors (see below), whose sum is σ = 135759864672. Its totient is φ = 135728936392.

The previous prime is 135744400483. The next prime is 135744400541. The reversal of 135744400531 is 135004447531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135004447531 = 53 ⋅2547253727.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135744400531 is a prime.

It is a super-2 number, since 2×135744400531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135744400541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7718896 + ... + 7736461.

It is an arithmetic number, because the mean of its divisors is an integer number (33939966168).

Almost surely, 2^135744400531 is an apocalyptic number.

135744400531 is a deficient number, since it is larger than the sum of its proper divisors (15464141).

135744400531 is an equidigital number, since it uses as much as digits as its factorization.

135744400531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15464140.

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 135744400531 in words is "one hundred thirty-five billion, seven hundred forty-four million, four hundred thousand, five hundred thirty-one".