736819561 has 4 divisors (see below), whose sum is σ = 738234324. Its totient is φ = 735404800.

The previous prime is 736819547. The next prime is 736819579. The reversal of 736819561 is 165918637.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 258566400 + 478253161 = 16080^2 + 21869^2 .

It is a cyclic number.

It is not a de Polignac number, because 736819561 - 2⁵ = 736819529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (736819261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706600 + ... + 707641.

It is an arithmetic number, because the mean of its divisors is an integer number (184558581).

Almost surely, 2^736819561 is an apocalyptic number.

It is an amenable number.

736819561 is a deficient number, since it is larger than the sum of its proper divisors (1414763).

736819561 is a wasteful number, since it uses less digits than its factorization.

736819561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414762.

The product of its digits is 272160, while the sum is 46.

The square root of 736819561 is about 27144.4204395673. The cubic root of 736819561 is about 903.2064888033.

The spelling of 736819561 in words is "seven hundred thirty-six million, eight hundred nineteen thousand, five hundred sixty-one".