1549422491 has 4 divisors (see below), whose sum is σ = 1555016352. Its totient is φ = 1543828632.

The previous prime is 1549422463. The next prime is 1549422521. The reversal of 1549422491 is 1942249451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1942249451 = 29 ⋅66974119.

It is a cyclic number.

It is not a de Polignac number, because 1549422491 - 2¹⁴ = 1549406107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1549422401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2796515 + ... + 2797068.

It is an arithmetic number, because the mean of its divisors is an integer number (388754088).

Almost surely, 2^1549422491 is an apocalyptic number.

1549422491 is a deficient number, since it is larger than the sum of its proper divisors (5593861).

1549422491 is an equidigital number, since it uses as much as digits as its factorization.

1549422491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593860.

The product of its digits is 103680, while the sum is 41.

The square root of 1549422491 is about 39362.7043151255. The cubic root of 1549422491 is about 1157.1507786547.

The spelling of 1549422491 in words is "one billion, five hundred forty-nine million, four hundred twenty-two thousand, four hundred ninety-one".