61844021 has 2 divisors, whose sum is σ = 61844022. Its totient is φ = 61844020.

The previous prime is 61843997. The next prime is 61844051. The reversal of 61844021 is 12044816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56415121 + 5428900 = 7511^2 + 2330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61844021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61844051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30922010 + 30922011.

It is an arithmetic number, because the mean of its divisors is an integer number (30922011).

Almost surely, 2^61844021 is an apocalyptic number.

It is an amenable number.

61844021 is a deficient number, since it is larger than the sum of its proper divisors (1).

61844021 is an equidigital number, since it uses as much as digits as its factorization.

61844021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 61844021 is about 7864.0969602364. The cubic root of 61844021 is about 395.4569747281.

Adding to 61844021 its reverse (12044816), we get a palindrome (73888837).

The spelling of 61844021 in words is "sixty-one million, eight hundred forty-four thousand, twenty-one".