1654138939 has 2 divisors, whose sum is σ = 1654138940. Its totient is φ = 1654138938.

The previous prime is 1654138907. The next prime is 1654138943. The reversal of 1654138939 is 9398314561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1654138939 - 2⁵ = 1654138907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1654138892 and 1654138901.

It is not a weakly prime, because it can be changed into another prime (1654138949) 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, 827069469 + 827069470.

It is an arithmetic number, because the mean of its divisors is an integer number (827069470).

Almost surely, 2^1654138939 is an apocalyptic number.

1654138939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1654138939 is an equidigital number, since it uses as much as digits as its factorization.

1654138939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 1654138939 is about 40671.1069310881. The cubic root of 1654138939 is about 1182.6529744422.

The spelling of 1654138939 in words is "one billion, six hundred fifty-four million, one hundred thirty-eight thousand, nine hundred thirty-nine".