1691124137 has 2 divisors, whose sum is σ = 1691124138. Its totient is φ = 1691124136.

The previous prime is 1691124119. The next prime is 1691124157. The reversal of 1691124137 is 7314211961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1323213376 + 367910761 = 36376^2 + 19181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691124137 - 2⁸ = 1691123881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1691124097 and 1691124106.

It is not a weakly prime, because it can be changed into another prime (1691124157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845562068 + 845562069.

It is an arithmetic number, because the mean of its divisors is an integer number (845562069).

Almost surely, 2^1691124137 is an apocalyptic number.

It is an amenable number.

1691124137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691124137 is an equidigital number, since it uses as much as digits as its factorization.

1691124137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 1691124137 is about 41123.2797451760. The cubic root of 1691124137 is about 1191.4024697719.

The spelling of 1691124137 in words is "one billion, six hundred ninety-one million, one hundred twenty-four thousand, one hundred thirty-seven".