61565419 has 2 divisors, whose sum is σ = 61565420. Its totient is φ = 61565418.

The previous prime is 61565401. The next prime is 61565431. The reversal of 61565419 is 91456516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61565419 - 2⁷ = 61565291 is a prime.

It is a super-2 number, since 2×61565419² = 7580601633291122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61565219) 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, 30782709 + 30782710.

It is an arithmetic number, because the mean of its divisors is an integer number (30782710).

Almost surely, 2^61565419 is an apocalyptic number.

61565419 is a deficient number, since it is larger than the sum of its proper divisors (1).

61565419 is an equidigital number, since it uses as much as digits as its factorization.

61565419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 61565419 is about 7846.3634251798. The cubic root of 61565419 is about 394.8622475380.

The spelling of 61565419 in words is "sixty-one million, five hundred sixty-five thousand, four hundred nineteen".