61573261 has 2 divisors, whose sum is σ = 61573262. Its totient is φ = 61573260.

The previous prime is 61573249. The next prime is 61573273. The reversal of 61573261 is 16237516.

61573261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (61573249) and next prime (61573273).

It can be written as a sum of positive squares in only one way, i.e., 42380100 + 19193161 = 6510^2 + 4381^2 .

It is a cyclic number.

It is not a de Polignac number, because 61573261 - 2⁵ = 61573229 is a prime.

It is a super-3 number, since 3×61573261³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61573961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30786630 + 30786631.

It is an arithmetic number, because the mean of its divisors is an integer number (30786631).

Almost surely, 2^61573261 is an apocalyptic number.

It is an amenable number.

61573261 is a deficient number, since it is larger than the sum of its proper divisors (1).

61573261 is an equidigital number, since it uses as much as digits as its factorization.

61573261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 61573261 is about 7846.8631312136. The cubic root of 61573261 is about 394.8790122431.

The spelling of 61573261 in words is "sixty-one million, five hundred seventy-three thousand, two hundred sixty-one".