61804121 has 2 divisors, whose sum is σ = 61804122. Its totient is φ = 61804120.

The previous prime is 61804117. The next prime is 61804139. The reversal of 61804121 is 12140816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 4044121 = 7600^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 61804121 - 2² = 61804117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61834121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30902060 + 30902061.

It is an arithmetic number, because the mean of its divisors is an integer number (30902061).

Almost surely, 2^61804121 is an apocalyptic number.

It is an amenable number.

61804121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61804121 is an equidigital number, since it uses as much as digits as its factorization.

61804121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 61804121 is about 7861.5597053002. The cubic root of 61804121 is about 395.3719105749.

Adding to 61804121 its reverse (12140816), we get a palindrome (73944937).

It can be divided in two parts, 6180 and 4121, that added together give a palindrome (10301).

The spelling of 61804121 in words is "sixty-one million, eight hundred four thousand, one hundred twenty-one".