135247861 has 4 divisors (see below), whose sum is σ = 154568992. Its totient is φ = 115926732.

The previous prime is 135247817. The next prime is 135247933. The reversal of 135247861 is 168742531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135247861 - 2⁹ = 135247349 is a prime.

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 135247861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135247661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9660555 + ... + 9660568.

It is an arithmetic number, because the mean of its divisors is an integer number (38642248).

Almost surely, 2^135247861 is an apocalyptic number.

It is an amenable number.

135247861 is a deficient number, since it is larger than the sum of its proper divisors (19321131).

135247861 is an equidigital number, since it uses as much as digits as its factorization.

135247861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19321130.

The product of its digits is 40320, while the sum is 37.

The square root of 135247861 is about 11629.6113864566. The cubic root of 135247861 is about 513.3065449093.

The spelling of 135247861 in words is "one hundred thirty-five million, two hundred forty-seven thousand, eight hundred sixty-one".