61820011 has 4 divisors (see below), whose sum is σ = 67440024. Its totient is φ = 56200000.

The previous prime is 61819997. The next prime is 61820039. The reversal of 61820011 is 11002816.

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

It is a cyclic number.

It is not a de Polignac number, because 61820011 - 2¹⁹ = 61295723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61820051) 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, 2809990 + ... + 2810011.

It is an arithmetic number, because the mean of its divisors is an integer number (16860006).

Almost surely, 2^61820011 is an apocalyptic number.

61820011 is a deficient number, since it is larger than the sum of its proper divisors (5620013).

61820011 is a wasteful number, since it uses less digits than its factorization.

61820011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5620012.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 61820011 is about 7862.5702540581. The cubic root of 61820011 is about 395.4057913864.

Adding to 61820011 its reverse (11002816), we get a palindrome (72822827).

The spelling of 61820011 in words is "sixty-one million, eight hundred twenty thousand, eleven".