61570213 has 2 divisors, whose sum is σ = 61570214. Its totient is φ = 61570212.

The previous prime is 61570211. The next prime is 61570273. The reversal of 61570213 is 31207516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55606849 + 5963364 = 7457^2 + 2442^2 .

It is a cyclic number.

It is not a de Polignac number, because 61570213 - 2¹ = 61570211 is a prime.

It is a super-2 number, since 2×61570213² = 7581782257730738, which contains 22 as substring.

Together with 61570211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61570211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30785106 + 30785107.

It is an arithmetic number, because the mean of its divisors is an integer number (30785107).

Almost surely, 2^61570213 is an apocalyptic number.

It is an amenable number.

61570213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61570213 is an equidigital number, since it uses as much as digits as its factorization.

61570213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 61570213 is about 7846.6689110730. The cubic root of 61570213 is about 394.8724963677.

Adding to 61570213 its reverse (31207516), we get a palindrome (92777729).

The spelling of 61570213 in words is "sixty-one million, five hundred seventy thousand, two hundred thirteen".