1548091381 has 2 divisors, whose sum is σ = 1548091382. Its totient is φ = 1548091380.

The previous prime is 1548091379. The next prime is 1548091393. The reversal of 1548091381 is 1831908451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1542132900 + 5958481 = 39270^2 + 2441^2 .

It is a cyclic number.

It is not a de Polignac number, because 1548091381 - 2¹ = 1548091379 is a prime.

It is a super-2 number, since 2×1548091381² = 4793173847852974322, which contains 22 as substring.

Together with 1548091379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1548091081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774045690 + 774045691.

It is an arithmetic number, because the mean of its divisors is an integer number (774045691).

Almost surely, 2^1548091381 is an apocalyptic number.

It is an amenable number.

1548091381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1548091381 is an equidigital number, since it uses as much as digits as its factorization.

1548091381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 1548091381 is about 39345.7924179956. The cubic root of 1548091381 is about 1156.8193140215.

The spelling of 1548091381 in words is "one billion, five hundred forty-eight million, ninety-one thousand, three hundred eighty-one".