61564423 has 2 divisors, whose sum is σ = 61564424. Its totient is φ = 61564422.

The previous prime is 61564421. The next prime is 61564441. The reversal of 61564423 is 32446516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61564423 - 2¹ = 61564421 is a prime.

Together with 61564421, 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 (61564421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30782211 + 30782212.

It is an arithmetic number, because the mean of its divisors is an integer number (30782212).

Almost surely, 2^61564423 is an apocalyptic number.

61564423 is a deficient number, since it is larger than the sum of its proper divisors (1).

61564423 is an equidigital number, since it uses as much as digits as its factorization.

61564423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 31.

The square root of 61564423 is about 7846.2999560302. The cubic root of 61564423 is about 394.8601181775.

The spelling of 61564423 in words is "sixty-one million, five hundred sixty-four thousand, four hundred twenty-three".