61803121 has 4 divisors (see below), whose sum is σ = 61819200. Its totient is φ = 61787044.

The previous prime is 61803101. The next prime is 61803127. The reversal of 61803121 is 12130816.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61803121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61803092 and 61803101.

It is not an unprimeable number, because it can be changed into a prime (61803127) 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, 1500 + ... + 11218.

It is an arithmetic number, because the mean of its divisors is an integer number (15454800).

Almost surely, 2^61803121 is an apocalyptic number.

It is an amenable number.

61803121 is a deficient number, since it is larger than the sum of its proper divisors (16079).

61803121 is an equidigital number, since it uses as much as digits as its factorization.

61803121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16078.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 61803121 is about 7861.4961044320. The cubic root of 61803121 is about 395.3697781710.

Adding to 61803121 its reverse (12130816), we get a palindrome (73933937).

The spelling of 61803121 in words is "sixty-one million, eight hundred three thousand, one hundred twenty-one".