61980619 has 2 divisors, whose sum is σ = 61980620. Its totient is φ = 61980618.

The previous prime is 61980557. The next prime is 61980637. The reversal of 61980619 is 91608916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61980619 - 2²⁵ = 28426187 is a prime.

It is a super-2 number, since 2×61980619² = 7683194263246322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61980649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30990309 + 30990310.

It is an arithmetic number, because the mean of its divisors is an integer number (30990310).

Almost surely, 2^61980619 is an apocalyptic number.

61980619 is a deficient number, since it is larger than the sum of its proper divisors (1).

61980619 is an equidigital number, since it uses as much as digits as its factorization.

61980619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 61980619 is about 7872.7770830883. Note that the first 3 decimals coincide. The cubic root of 61980619 is about 395.7479158651.

The spelling of 61980619 in words is "sixty-one million, nine hundred eighty thousand, six hundred nineteen".