1209370139 has 2 divisors, whose sum is σ = 1209370140. Its totient is φ = 1209370138.

The previous prime is 1209370111. The next prime is 1209370189. The reversal of 1209370139 is 9310739021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209370139 is a prime.

It is a super-2 number, since 2×1209370139² = 2925152266209758642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1209370099 and 1209370108.

It is not a weakly prime, because it can be changed into another prime (1209370189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604685069 + 604685070.

It is an arithmetic number, because the mean of its divisors is an integer number (604685070).

Almost surely, 2^1209370139 is an apocalyptic number.

1209370139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209370139 is an equidigital number, since it uses as much as digits as its factorization.

1209370139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 1209370139 is about 34775.9994680239. Note that the first 3 decimals coincide. The cubic root of 1209370139 is about 1065.4173062475.

The spelling of 1209370139 in words is "one billion, two hundred nine million, three hundred seventy thousand, one hundred thirty-nine".