61212287 has 2 divisors, whose sum is σ = 61212288. Its totient is φ = 61212286.

The previous prime is 61212247. The next prime is 61212293. The reversal of 61212287 is 78221216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61212287 - 2¹⁶ = 61146751 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 (61212227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606143 + 30606144.

It is an arithmetic number, because the mean of its divisors is an integer number (30606144).

Almost surely, 2^61212287 is an apocalyptic number.

61212287 is a deficient number, since it is larger than the sum of its proper divisors (1).

61212287 is an equidigital number, since it uses as much as digits as its factorization.

61212287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 61212287 is about 7823.8281550658. The cubic root of 61212287 is about 394.1058383329.

The spelling of 61212287 in words is "sixty-one million, two hundred twelve thousand, two hundred eighty-seven".