1548401861 has 2 divisors, whose sum is σ = 1548401862. Its totient is φ = 1548401860.

The previous prime is 1548401821. The next prime is 1548401879. The reversal of 1548401861 is 1681048451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1498077025 + 50324836 = 38705^2 + 7094^2 .

It is a cyclic number.

It is not a de Polignac number, because 1548401861 - 2³⁰ = 474660037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1548401801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774200930 + 774200931.

It is an arithmetic number, because the mean of its divisors is an integer number (774200931).

Almost surely, 2^1548401861 is an apocalyptic number.

It is an amenable number.

1548401861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1548401861 is an equidigital number, since it uses as much as digits as its factorization.

1548401861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 1548401861 is about 39349.7377500791. The cubic root of 1548401861 is about 1156.8966447821.

The spelling of 1548401861 in words is "one billion, five hundred forty-eight million, four hundred one thousand, eight hundred sixty-one".