61564487 has 2 divisors, whose sum is σ = 61564488. Its totient is φ = 61564486.

The previous prime is 61564441. The next prime is 61564499. The reversal of 61564487 is 78446516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61564487 - 2⁶ = 61564423 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 (61564417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30782243 + 30782244.

It is an arithmetic number, because the mean of its divisors is an integer number (30782244).

Almost surely, 2^61564487 is an apocalyptic number.

61564487 is a deficient number, since it is larger than the sum of its proper divisors (1).

61564487 is an equidigital number, since it uses as much as digits as its factorization.

61564487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 41.

The square root of 61564487 is about 7846.3040343846. The cubic root of 61564487 is about 394.8602550046.

The spelling of 61564487 in words is "sixty-one million, five hundred sixty-four thousand, four hundred eighty-seven".