61609871 has 2 divisors, whose sum is σ = 61609872. Its totient is φ = 61609870.

The previous prime is 61609829. The next prime is 61609879. The reversal of 61609871 is 17890616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61609871 - 2¹⁴ = 61593487 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 (61609879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30804935 + 30804936.

It is an arithmetic number, because the mean of its divisors is an integer number (30804936).

Almost surely, 2^61609871 is an apocalyptic number.

61609871 is a deficient number, since it is larger than the sum of its proper divisors (1).

61609871 is an equidigital number, since it uses as much as digits as its factorization.

61609871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 61609871 is about 7849.1955638779. The cubic root of 61609871 is about 394.9572586344.

The spelling of 61609871 in words is "sixty-one million, six hundred nine thousand, eight hundred seventy-one".