61820587 has 2 divisors, whose sum is σ = 61820588. Its totient is φ = 61820586.

The previous prime is 61820569. The next prime is 61820593. The reversal of 61820587 is 78502816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61820587 - 2⁷ = 61820459 is a prime.

It is not a weakly prime, because it can be changed into another prime (61820567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910293 + 30910294.

It is an arithmetic number, because the mean of its divisors is an integer number (30910294).

Almost surely, 2^61820587 is an apocalyptic number.

61820587 is a deficient number, since it is larger than the sum of its proper divisors (1).

61820587 is an equidigital number, since it uses as much as digits as its factorization.

61820587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 61820587 is about 7862.6068832163. The cubic root of 61820587 is about 395.4070194301.

The spelling of 61820587 in words is "sixty-one million, eight hundred twenty thousand, five hundred eighty-seven".