61739819 has 2 divisors, whose sum is σ = 61739820. Its totient is φ = 61739818.

The previous prime is 61739803. The next prime is 61739831. The reversal of 61739819 is 91893716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61739819 - 2⁴ = 61739803 is a prime.

It is a super-2 number, since 2×61739819² = 7623610500305522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61739819.

It is not a weakly prime, because it can be changed into another prime (61739519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30869909 + 30869910.

It is an arithmetic number, because the mean of its divisors is an integer number (30869910).

Almost surely, 2^61739819 is an apocalyptic number.

61739819 is a deficient number, since it is larger than the sum of its proper divisors (1).

61739819 is an equidigital number, since it uses as much as digits as its factorization.

61739819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 61739819 is about 7857.4689945300. The cubic root of 61739819 is about 395.2347458994.

The spelling of 61739819 in words is "sixty-one million, seven hundred thirty-nine thousand, eight hundred nineteen".