1549494451 has 2 divisors, whose sum is σ = 1549494452. Its totient is φ = 1549494450.

The previous prime is 1549494413. The next prime is 1549494493. The reversal of 1549494451 is 1544949451.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1549494451 is a prime.

It is not a weakly prime, because it can be changed into another prime (1549494151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774747225 + 774747226.

It is an arithmetic number, because the mean of its divisors is an integer number (774747226).

Almost surely, 2^1549494451 is an apocalyptic number.

1549494451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549494451 is an equidigital number, since it uses as much as digits as its factorization.

1549494451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 46.

The square root of 1549494451 is about 39363.6183677263. The cubic root of 1549494451 is about 1157.1686922713.

The spelling of 1549494451 in words is "one billion, five hundred forty-nine million, four hundred ninety-four thousand, four hundred fifty-one".