61387211 has 2 divisors, whose sum is σ = 61387212. Its totient is φ = 61387210.

The previous prime is 61387201. The next prime is 61387213. The reversal of 61387211 is 11278316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61387211 - 2¹⁰ = 61386187 is a prime.

It is a Sophie Germain prime.

Together with 61387213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61387213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30693605 + 30693606.

It is an arithmetic number, because the mean of its divisors is an integer number (30693606).

Almost surely, 2^61387211 is an apocalyptic number.

61387211 is a deficient number, since it is larger than the sum of its proper divisors (1).

61387211 is an equidigital number, since it uses as much as digits as its factorization.

61387211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 61387211 is about 7834.9991065730. Note that the first 3 decimals coincide. The cubic root of 61387211 is about 394.4808883400.

The spelling of 61387211 in words is "sixty-one million, three hundred eighty-seven thousand, two hundred eleven".