61747457 has 2 divisors, whose sum is σ = 61747458. Its totient is φ = 61747456.

The previous prime is 61747429. The next prime is 61747459. The reversal of 61747457 is 75474716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33189121 + 28558336 = 5761^2 + 5344^2 .

It is a cyclic number.

It is not a de Polignac number, because 61747457 - 2¹² = 61743361 is a prime.

Together with 61747459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61747459) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30873728 + 30873729.

It is an arithmetic number, because the mean of its divisors is an integer number (30873729).

Almost surely, 2^61747457 is an apocalyptic number.

It is an amenable number.

61747457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61747457 is an equidigital number, since it uses as much as digits as its factorization.

61747457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 41.

The square root of 61747457 is about 7857.9550138697. The cubic root of 61747457 is about 395.2510437472.

It can be divided in two parts, 6174 and 7457, that added together give a palindrome (13631).

The spelling of 61747457 in words is "sixty-one million, seven hundred forty-seven thousand, four hundred fifty-seven".