61001821 has 8 divisors (see below), whose sum is σ = 62637344. Its totient is φ = 59376240.

The previous prime is 61001803. The next prime is 61001827. The reversal of 61001821 is 12810016.

61001821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61001821 - 2⁹ = 61001309 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 (61001827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10891 + ... + 15511.

It is an arithmetic number, because the mean of its divisors is an integer number (7829668).

Almost surely, 2^61001821 is an apocalyptic number.

It is an amenable number.

61001821 is a deficient number, since it is larger than the sum of its proper divisors (1635523).

61001821 is a wasteful number, since it uses less digits than its factorization.

61001821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4971.

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

The square root of 61001821 is about 7810.3662526158. The cubic root of 61001821 is about 393.6536354086.

Adding to 61001821 its reverse (12810016), we get a palindrome (73811837).

It can be divided in two parts, 6100 and 1821, that added together give a square (7921 = 89²).

The spelling of 61001821 in words is "sixty-one million, one thousand, eight hundred twenty-one".