61764139 has 2 divisors, whose sum is σ = 61764140. Its totient is φ = 61764138.

The previous prime is 61764127. The next prime is 61764149. The reversal of 61764139 is 93146716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61764139 - 2⁹ = 61763627 is a prime.

It is a super-2 number, since 2×61764139² = 7629617732822642, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61764098 and 61764107.

It is not a weakly prime, because it can be changed into another prime (61764149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30882069 + 30882070.

It is an arithmetic number, because the mean of its divisors is an integer number (30882070).

Almost surely, 2^61764139 is an apocalyptic number.

61764139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61764139 is an equidigital number, since it uses as much as digits as its factorization.

61764139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 61764139 is about 7859.0164142849. The cubic root of 61764139 is about 395.2866348713.

The spelling of 61764139 in words is "sixty-one million, seven hundred sixty-four thousand, one hundred thirty-nine".