61211382139 has 2 divisors, whose sum is σ = 61211382140. Its totient is φ = 61211382138.

The previous prime is 61211382109. The next prime is 61211382161. The reversal of 61211382139 is 93128311216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61211382139 - 2¹³ = 61211373947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61211382098 and 61211382107.

It is not a weakly prime, because it can be changed into another prime (61211382109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30605691069 + 30605691070.

It is an arithmetic number, because the mean of its divisors is an integer number (30605691070).

Almost surely, 2^61211382139 is an apocalyptic number.

61211382139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61211382139 is an equidigital number, since it uses as much as digits as its factorization.

61211382139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The spelling of 61211382139 in words is "sixty-one billion, two hundred eleven million, three hundred eighty-two thousand, one hundred thirty-nine".