61045921 has 2 divisors, whose sum is σ = 61045922. Its totient is φ = 61045920.

The previous prime is 61045889. The next prime is 61045931. The reversal of 61045921 is 12954016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53949025 + 7096896 = 7345^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 61045921 - 2⁵ = 61045889 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61045921.

It is not a weakly prime, because it can be changed into another prime (61045931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30522960 + 30522961.

It is an arithmetic number, because the mean of its divisors is an integer number (30522961).

Almost surely, 2^61045921 is an apocalyptic number.

It is an amenable number.

61045921 is a deficient number, since it is larger than the sum of its proper divisors (1).

61045921 is an equidigital number, since it uses as much as digits as its factorization.

61045921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 61045921 is about 7813.1889136255. The cubic root of 61045921 is about 393.7484737994.

Adding to 61045921 its reverse (12954016), we get a palindrome (73999937).

The spelling of 61045921 in words is "sixty-one million, forty-five thousand, nine hundred twenty-one".