61573717 has 2 divisors, whose sum is σ = 61573718. Its totient is φ = 61573716.

The previous prime is 61573703. The next prime is 61573727. The reversal of 61573717 is 71737516.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57138481 + 4435236 = 7559^2 + 2106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61573717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61573727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30786858 + 30786859.

It is an arithmetic number, because the mean of its divisors is an integer number (30786859).

Almost surely, 2^61573717 is an apocalyptic number.

It is an amenable number.

61573717 is a deficient number, since it is larger than the sum of its proper divisors (1).

61573717 is an equidigital number, since it uses as much as digits as its factorization.

61573717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30870, while the sum is 37.

The square root of 61573717 is about 7846.8921873567. The cubic root of 61573717 is about 394.8799870406.

The spelling of 61573717 in words is "sixty-one million, five hundred seventy-three thousand, seven hundred seventeen".