1640623319 has 2 divisors, whose sum is σ = 1640623320. Its totient is φ = 1640623318.

The previous prime is 1640623297. The next prime is 1640623339. The reversal of 1640623319 is 9133260461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640623319 is a prime.

It is a super-2 number, since 2×1640623319² = 5383289749693151522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640623339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820311659 + 820311660.

It is an arithmetic number, because the mean of its divisors is an integer number (820311660).

Almost surely, 2^1640623319 is an apocalyptic number.

1640623319 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640623319 is an equidigital number, since it uses as much as digits as its factorization.

1640623319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 1640623319 is about 40504.6086143293. The cubic root of 1640623319 is about 1179.4230922628.

The spelling of 1640623319 in words is "one billion, six hundred forty million, six hundred twenty-three thousand, three hundred nineteen".