1909656137 has 2 divisors, whose sum is σ = 1909656138. Its totient is φ = 1909656136.

The previous prime is 1909656103. The next prime is 1909656157. The reversal of 1909656137 is 7316569091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1067263561 + 842392576 = 32669^2 + 29024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909656137 - 2¹⁰ = 1909655113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1909656091 and 1909656100.

It is not a weakly prime, because it can be changed into another prime (1909656157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954828068 + 954828069.

It is an arithmetic number, because the mean of its divisors is an integer number (954828069).

Almost surely, 2^1909656137 is an apocalyptic number.

It is an amenable number.

1909656137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909656137 is an equidigital number, since it uses as much as digits as its factorization.

1909656137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 1909656137 is about 43699.6125497698. The cubic root of 1909656137 is about 1240.6569829746.

The spelling of 1909656137 in words is "one billion, nine hundred nine million, six hundred fifty-six thousand, one hundred thirty-seven".