1549531 has 2 divisors, whose sum is σ = 1549532. Its totient is φ = 1549530.

The previous prime is 1549529. The next prime is 1549547. The reversal of 1549531 is 1359451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1549531 - 2¹ = 1549529 is a prime.

It is a super-2 number, since 2×1549531² = 4802092639922, which contains 22 as substring.

Together with 1549529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1549531.

It is not a weakly prime, because it can be changed into another prime (1549501) 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 as a sum of consecutive naturals, namely, 774765 + 774766.

It is an arithmetic number, because the mean of its divisors is an integer number (774766).

2^1549531 is an apocalyptic number.

1549531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549531 is an equidigital number, since it uses as much as digits as its factorization.

1549531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 28.

The square root of 1549531 is about 1244.8015906160. The cubic root of 1549531 is about 115.7177790513.

It can be divided in two parts, 1549 and 531, that added together give a triangular number (2080 = T₆₄).

The spelling of 1549531 in words is "one million, five hundred forty-nine thousand, five hundred thirty-one".