61904257 has 2 divisors, whose sum is σ = 61904258. Its totient is φ = 61904256.

The previous prime is 61904243. The next prime is 61904263. The reversal of 61904257 is 75240916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58384881 + 3519376 = 7641^2 + 1876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61904257 is a prime.

It is not a weakly prime, because it can be changed into another prime (61904207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30952128 + 30952129.

It is an arithmetic number, because the mean of its divisors is an integer number (30952129).

Almost surely, 2^61904257 is an apocalyptic number.

It is an amenable number.

61904257 is a deficient number, since it is larger than the sum of its proper divisors (1).

61904257 is an equidigital number, since it uses as much as digits as its factorization.

61904257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 61904257 is about 7867.9258384914. The cubic root of 61904257 is about 395.5853246011.

The spelling of 61904257 in words is "sixty-one million, nine hundred four thousand, two hundred fifty-seven".