61320617 has 2 divisors, whose sum is σ = 61320618. Its totient is φ = 61320616.

The previous prime is 61320607. The next prime is 61320643. The reversal of 61320617 is 71602316.

It is an a-pointer prime, because the next prime (61320643) can be obtained adding 61320617 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55190041 + 6130576 = 7429^2 + 2476^2 .

It is a cyclic number.

It is not a de Polignac number, because 61320617 - 2⁴ = 61320601 is a prime.

It is not a weakly prime, because it can be changed into another prime (61320607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30660308 + 30660309.

It is an arithmetic number, because the mean of its divisors is an integer number (30660309).

Almost surely, 2^61320617 is an apocalyptic number.

It is an amenable number.

61320617 is a deficient number, since it is larger than the sum of its proper divisors (1).

61320617 is an equidigital number, since it uses as much as digits as its factorization.

61320617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 61320617 is about 7830.7481762600. The cubic root of 61320617 is about 394.3381899668.

The spelling of 61320617 in words is "sixty-one million, three hundred twenty thousand, six hundred seventeen".