1640631017 has 2 divisors, whose sum is σ = 1640631018. Its totient is φ = 1640631016.

The previous prime is 1640631001. The next prime is 1640631119. The reversal of 1640631017 is 7101360461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1567288921 + 73342096 = 39589^2 + 8564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640631017 - 2⁴ = 1640631001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640631217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820315508 + 820315509.

It is an arithmetic number, because the mean of its divisors is an integer number (820315509).

Almost surely, 2^1640631017 is an apocalyptic number.

It is an amenable number.

1640631017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640631017 is an equidigital number, since it uses as much as digits as its factorization.

1640631017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1640631017 is about 40504.7036404416. The cubic root of 1640631017 is about 1179.4249369245.

Adding to 1640631017 its reverse (7101360461), we get a palindrome (8741991478).

The spelling of 1640631017 in words is "one billion, six hundred forty million, six hundred thirty-one thousand, seventeen".