61204139 has 2 divisors, whose sum is σ = 61204140. Its totient is φ = 61204138.

The previous prime is 61204109. The next prime is 61204151. The reversal of 61204139 is 93140216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61204139 - 2²⁴ = 44426923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61204109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30602069 + 30602070.

It is an arithmetic number, because the mean of its divisors is an integer number (30602070).

Almost surely, 2^61204139 is an apocalyptic number.

61204139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61204139 is an equidigital number, since it uses as much as digits as its factorization.

61204139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 61204139 is about 7823.3074207780. The cubic root of 61204139 is about 394.0883510112.

The spelling of 61204139 in words is "sixty-one million, two hundred four thousand, one hundred thirty-nine".