1548665401 has 2 divisors, whose sum is σ = 1548665402. Its totient is φ = 1548665400.

The previous prime is 1548665387. The next prime is 1548665411. The reversal of 1548665401 is 1045668451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1041740176 + 506925225 = 32276^2 + 22515^2 .

It is an emirp because it is prime and its reverse (1045668451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1548665401 - 2⁷ = 1548665273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1548665411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774332700 + 774332701.

It is an arithmetic number, because the mean of its divisors is an integer number (774332701).

Almost surely, 2^1548665401 is an apocalyptic number.

It is an amenable number.

1548665401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1548665401 is an equidigital number, since it uses as much as digits as its factorization.

1548665401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 1548665401 is about 39353.0862957405. The cubic root of 1548665401 is about 1156.9622761606.

The spelling of 1548665401 in words is "one billion, five hundred forty-eight million, six hundred sixty-five thousand, four hundred one".