1542401009 has 2 divisors, whose sum is σ = 1542401010. Its totient is φ = 1542401008.

The previous prime is 1542400933. The next prime is 1542401011. The reversal of 1542401009 is 9001042451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894189409 + 648211600 = 29903^2 + 25460^2 .

It is an emirp because it is prime and its reverse (9001042451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1542401009 - 2¹² = 1542396913 is a prime.

Together with 1542401011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1542401309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771200504 + 771200505.

It is an arithmetic number, because the mean of its divisors is an integer number (771200505).

Almost surely, 2^1542401009 is an apocalyptic number.

It is an amenable number.

1542401009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542401009 is an equidigital number, since it uses as much as digits as its factorization.

1542401009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1542401009 is about 39273.4135134699. The cubic root of 1542401009 is about 1155.4001871572.

The spelling of 1542401009 in words is "one billion, five hundred forty-two million, four hundred one thousand, nine".