61243139 has 2 divisors, whose sum is σ = 61243140. Its totient is φ = 61243138.

The previous prime is 61243111. The next prime is 61243183. The reversal of 61243139 is 93134216.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61243139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61243199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30621569 + 30621570.

It is an arithmetic number, because the mean of its divisors is an integer number (30621570).

Almost surely, 2^61243139 is an apocalyptic number.

61243139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61243139 is an equidigital number, since it uses as much as digits as its factorization.

61243139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 61243139 is about 7825.7995757622. The cubic root of 61243139 is about 394.1720391548.

The spelling of 61243139 in words is "sixty-one million, two hundred forty-three thousand, one hundred thirty-nine".