61549457 has 2 divisors, whose sum is σ = 61549458. Its totient is φ = 61549456.

The previous prime is 61549451. The next prime is 61549489. The reversal of 61549457 is 75494516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57093136 + 4456321 = 7556^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 61549457 - 2⁴ = 61549441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61549451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30774728 + 30774729.

It is an arithmetic number, because the mean of its divisors is an integer number (30774729).

Almost surely, 2^61549457 is an apocalyptic number.

It is an amenable number.

61549457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61549457 is an equidigital number, since it uses as much as digits as its factorization.

61549457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 61549457 is about 7845.3462001367. The cubic root of 61549457 is about 394.8281194183.

The spelling of 61549457 in words is "sixty-one million, five hundred forty-nine thousand, four hundred fifty-seven".