61570813 has 2 divisors, whose sum is σ = 61570814. Its totient is φ = 61570812.

The previous prime is 61570801. The next prime is 61570819. The reversal of 61570813 is 31807516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46539684 + 15031129 = 6822^2 + 3877^2 .

It is a cyclic number.

It is not a de Polignac number, because 61570813 - 2⁵ = 61570781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61570819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30785406 + 30785407.

It is an arithmetic number, because the mean of its divisors is an integer number (30785407).

Almost surely, 2^61570813 is an apocalyptic number.

It is an amenable number.

61570813 is a deficient number, since it is larger than the sum of its proper divisors (1).

61570813 is an equidigital number, since it uses as much as digits as its factorization.

61570813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 61570813 is about 7846.7071437642. The cubic root of 61570813 is about 394.8737790374.

The spelling of 61570813 in words is "sixty-one million, five hundred seventy thousand, eight hundred thirteen".