61043921 has 2 divisors, whose sum is σ = 61043922. Its totient is φ = 61043920.

The previous prime is 61043887. The next prime is 61043933. The reversal of 61043921 is 12934016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58354321 + 2689600 = 7639^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 61043921 - 2¹⁴ = 61027537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61043951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30521960 + 30521961.

It is an arithmetic number, because the mean of its divisors is an integer number (30521961).

Almost surely, 2^61043921 is an apocalyptic number.

It is an amenable number.

61043921 is a deficient number, since it is larger than the sum of its proper divisors (1).

61043921 is an equidigital number, since it uses as much as digits as its factorization.

61043921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 61043921 is about 7813.0609238633. The cubic root of 61043921 is about 393.7441737275.

Adding to 61043921 its reverse (12934016), we get a palindrome (73977937).

The spelling of 61043921 in words is "sixty-one million, forty-three thousand, nine hundred twenty-one".