61519519 has 2 divisors, whose sum is σ = 61519520. Its totient is φ = 61519518.

The previous prime is 61519499. The next prime is 61519553. The reversal of 61519519 is 91591516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61519519 - 2⁵ = 61519487 is a prime.

It is a super-2 number, since 2×61519519² = 7569302435982722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61519589) 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, 30759759 + 30759760.

It is an arithmetic number, because the mean of its divisors is an integer number (30759760).

Almost surely, 2^61519519 is an apocalyptic number.

61519519 is a deficient number, since it is larger than the sum of its proper divisors (1).

61519519 is an equidigital number, since it uses as much as digits as its factorization.

61519519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12150, while the sum is 37.

The square root of 61519519 is about 7843.4379579366. The cubic root of 61519519 is about 394.7640935014.

The spelling of 61519519 in words is "sixty-one million, five hundred nineteen thousand, five hundred nineteen".