61717553 has 2 divisors, whose sum is σ = 61717554. Its totient is φ = 61717552.

The previous prime is 61717547. The next prime is 61717571. The reversal of 61717553 is 35571716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49801249 + 11916304 = 7057^2 + 3452^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61717553 is a prime.

It is not a weakly prime, because it can be changed into another prime (61717583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30858776 + 30858777.

It is an arithmetic number, because the mean of its divisors is an integer number (30858777).

Almost surely, 2^61717553 is an apocalyptic number.

It is an amenable number.

61717553 is a deficient number, since it is larger than the sum of its proper divisors (1).

61717553 is an equidigital number, since it uses as much as digits as its factorization.

61717553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050, while the sum is 35.

The square root of 61717553 is about 7856.0519983004. The cubic root of 61717553 is about 395.1872273767.

The spelling of 61717553 in words is "sixty-one million, seven hundred seventeen thousand, five hundred fifty-three".