1381025549 has 8 divisors (see below), whose sum is σ = 1478693880. Its totient is φ = 1285182976.

The previous prime is 1381025519. The next prime is 1381025557. The reversal of 1381025549 is 9455201831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 110103049 + 1270922500 = 10493^2 + 35650^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381025549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381025519) 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 in 7 ways as a sum of consecutive naturals, for example, 454874 + ... + 457899.

It is an arithmetic number, because the mean of its divisors is an integer number (184836735).

Almost surely, 2^1381025549 is an apocalyptic number.

It is an amenable number.

1381025549 is a deficient number, since it is larger than the sum of its proper divisors (97668331).

1381025549 is an equidigital number, since it uses as much as digits as its factorization.

1381025549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912879.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 1381025549 is about 37162.1521039888. The cubic root of 1381025549 is about 1113.6120057210.

The spelling of 1381025549 in words is "one billion, three hundred eighty-one million, twenty-five thousand, five hundred forty-nine".