1654721429 has 2 divisors, whose sum is σ = 1654721430. Its totient is φ = 1654721428.

The previous prime is 1654721423. The next prime is 1654721447. The reversal of 1654721429 is 9241274561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1634018929 + 20702500 = 40423^2 + 4550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1654721429 - 2¹² = 1654717333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1654721423) 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, 827360714 + 827360715.

It is an arithmetic number, because the mean of its divisors is an integer number (827360715).

Almost surely, 2^1654721429 is an apocalyptic number.

It is an amenable number.

1654721429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1654721429 is an equidigital number, since it uses as much as digits as its factorization.

1654721429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 1654721429 is about 40678.2672811908. The cubic root of 1654721429 is about 1182.7917783176.

The spelling of 1654721429 in words is "one billion, six hundred fifty-four million, seven hundred twenty-one thousand, four hundred twenty-nine".