61781119 has 2 divisors, whose sum is σ = 61781120. Its totient is φ = 61781118.

The previous prime is 61781117. The next prime is 61781123. The reversal of 61781119 is 91118716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61781119 - 2¹ = 61781117 is a prime.

It is a super-2 number, since 2×61781119² = 7633813329784322, which contains 22 as substring.

Together with 61781117, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61781113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30890559 + 30890560.

It is an arithmetic number, because the mean of its divisors is an integer number (30890560).

Almost surely, 2^61781119 is an apocalyptic number.

61781119 is a deficient number, since it is larger than the sum of its proper divisors (1).

61781119 is an equidigital number, since it uses as much as digits as its factorization.

61781119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 34.

The square root of 61781119 is about 7860.0966279048. The cubic root of 61781119 is about 395.3228551991.

The spelling of 61781119 in words is "sixty-one million, seven hundred eighty-one thousand, one hundred nineteen".