61211207 has 2 divisors, whose sum is σ = 61211208. Its totient is φ = 61211206.

The previous prime is 61211173. The next prime is 61211221. The reversal of 61211207 is 70211216.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61211207 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61211287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30605603 + 30605604.

It is an arithmetic number, because the mean of its divisors is an integer number (30605604).

Almost surely, 2^61211207 is an apocalyptic number.

61211207 is a deficient number, since it is larger than the sum of its proper divisors (1).

61211207 is an equidigital number, since it uses as much as digits as its factorization.

61211207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 61211207 is about 7823.7591348405. The cubic root of 61211207 is about 394.1035205150.

Subtracting 61211207 from its reverse (70211216), we obtain a palindrome (9000009).

The spelling of 61211207 in words is "sixty-one million, two hundred eleven thousand, two hundred seven".