61655519 has 2 divisors, whose sum is σ = 61655520. Its totient is φ = 61655518.

The previous prime is 61655501. The next prime is 61655521. The reversal of 61655519 is 91555616.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61655519 - 2¹² = 61651423 is a prime.

It is a super-2 number, since 2×61655519² = 7602806046318722, which contains 22 as substring.

Together with 61655521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61654519) 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, 30827759 + 30827760.

It is an arithmetic number, because the mean of its divisors is an integer number (30827760).

Almost surely, 2^61655519 is an apocalyptic number.

61655519 is a deficient number, since it is larger than the sum of its proper divisors (1).

61655519 is an equidigital number, since it uses as much as digits as its factorization.

61655519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 38.

The square root of 61655519 is about 7852.1028393673. The cubic root of 61655519 is about 395.0547784950.

The spelling of 61655519 in words is "sixty-one million, six hundred fifty-five thousand, five hundred nineteen".