61689587 has 2 divisors, whose sum is σ = 61689588. Its totient is φ = 61689586.

The previous prime is 61689581. The next prime is 61689629. The reversal of 61689587 is 78598616.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61689587 - 2⁴ = 61689571 is a prime.

It is not a weakly prime, because it can be changed into another prime (61689581) 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, 30844793 + 30844794.

It is an arithmetic number, because the mean of its divisors is an integer number (30844794).

Almost surely, 2^61689587 is an apocalyptic number.

61689587 is a deficient number, since it is larger than the sum of its proper divisors (1).

61689587 is an equidigital number, since it uses as much as digits as its factorization.

61689587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 50.

The square root of 61689587 is about 7854.2718949626. The cubic root of 61689587 is about 395.1275281221.

The spelling of 61689587 in words is "sixty-one million, six hundred eighty-nine thousand, five hundred eighty-seven".