135777649 has 4 divisors (see below), whose sum is σ = 155174464. Its totient is φ = 116380836.

The previous prime is 135777647. The next prime is 135777659. The reversal of 135777649 is 946777531.

135777649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 135777649 - 2¹ = 135777647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135777641) 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, 9698397 + ... + 9698410.

It is an arithmetic number, because the mean of its divisors is an integer number (38793616).

Almost surely, 2^135777649 is an apocalyptic number.

It is an amenable number.

135777649 is a deficient number, since it is larger than the sum of its proper divisors (19396815).

135777649 is an equidigital number, since it uses as much as digits as its factorization.

135777649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19396814.

The product of its digits is 1111320, while the sum is 49.

The square root of 135777649 is about 11652.3666694796. The cubic root of 135777649 is about 513.9759069087.

The spelling of 135777649 in words is "one hundred thirty-five million, seven hundred seventy-seven thousand, six hundred forty-nine".