1649139923 has 2 divisors, whose sum is σ = 1649139924. Its totient is φ = 1649139922.

The previous prime is 1649139911. The next prime is 1649139929. The reversal of 1649139923 is 3299319461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1649139923 - 2¹² = 1649135827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1649139929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824569961 + 824569962.

It is an arithmetic number, because the mean of its divisors is an integer number (824569962).

Almost surely, 2^1649139923 is an apocalyptic number.

1649139923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649139923 is an equidigital number, since it uses as much as digits as its factorization.

1649139923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 47.

The square root of 1649139923 is about 40609.6038271737. The cubic root of 1649139923 is about 1181.4603968970.

The spelling of 1649139923 in words is "one billion, six hundred forty-nine million, one hundred thirty-nine thousand, nine hundred twenty-three".