1631490109 has 2 divisors, whose sum is σ = 1631490110. Its totient is φ = 1631490108.

The previous prime is 1631490089. The next prime is 1631490131. The reversal of 1631490109 is 9010941361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1532487609 + 99002500 = 39147^2 + 9950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631490109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631490169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815745054 + 815745055.

It is an arithmetic number, because the mean of its divisors is an integer number (815745055).

Almost surely, 2^1631490109 is an apocalyptic number.

It is an amenable number.

1631490109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631490109 is an equidigital number, since it uses as much as digits as its factorization.

1631490109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1631490109 is about 40391.7084189317. The cubic root of 1631490109 is about 1177.2304358722.

The spelling of 1631490109 in words is "one billion, six hundred thirty-one million, four hundred ninety thousand, one hundred nine".