61793821 has 4 divisors (see below), whose sum is σ = 61846812. Its totient is φ = 61740832.

The previous prime is 61793807. The next prime is 61793869. The reversal of 61793821 is 12839716.

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 21724921 + 40068900 = 4661^2 + 6330^2 .

It is a cyclic number.

It is not a de Polignac number, because 61793821 - 2¹³ = 61785629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61793621) 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, 24706 + ... + 27091.

It is an arithmetic number, because the mean of its divisors is an integer number (15461703).

Almost surely, 2^61793821 is an apocalyptic number.

It is an amenable number.

61793821 is a deficient number, since it is larger than the sum of its proper divisors (52991).

61793821 is a wasteful number, since it uses less digits than its factorization.

61793821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52990.

The product of its digits is 18144, while the sum is 37.

The square root of 61793821 is about 7860.9045917121. The cubic root of 61793821 is about 395.3499457131.

It can be divided in two parts, 6179 and 3821, that added together give a 4-th power (10000 = 10⁴).

The spelling of 61793821 in words is "sixty-one million, seven hundred ninety-three thousand, eight hundred twenty-one".