61428559 has 2 divisors, whose sum is σ = 61428560. Its totient is φ = 61428558.

The previous prime is 61428557. The next prime is 61428581. The reversal of 61428559 is 95582416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61428559 - 2¹ = 61428557 is a prime.

Together with 61428557, 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 (61428557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30714279 + 30714280.

It is an arithmetic number, because the mean of its divisors is an integer number (30714280).

Almost surely, 2^61428559 is an apocalyptic number.

61428559 is a deficient number, since it is larger than the sum of its proper divisors (1).

61428559 is an equidigital number, since it uses as much as digits as its factorization.

61428559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The square root of 61428559 is about 7837.6373353199. The cubic root of 61428559 is about 394.5694373756.

The spelling of 61428559 in words is "sixty-one million, four hundred twenty-eight thousand, five hundred fifty-nine".