1531949649 has 8 divisors (see below), whose sum is σ = 2043085152. Its totient is φ = 1021056960.

The previous prime is 1531949647. The next prime is 1531949663. The reversal of 1531949649 is 9469491351.

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

It is not a de Polignac number, because 1531949649 - 2¹ = 1531949647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1531949647) 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 in 7 ways as a sum of consecutive naturals, for example, 45432 + ... + 71609.

It is an arithmetic number, because the mean of its divisors is an integer number (255385644).

Almost surely, 2^1531949649 is an apocalyptic number.

It is an amenable number.

1531949649 is a deficient number, since it is larger than the sum of its proper divisors (511135503).

1531949649 is a wasteful number, since it uses less digits than its factorization.

1531949649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121407.

The product of its digits is 1049760, while the sum is 51.

The square root of 1531949649 is about 39140.1283722984. The cubic root of 1531949649 is about 1152.7845938842.

The spelling of 1531949649 in words is "one billion, five hundred thirty-one million, nine hundred forty-nine thousand, six hundred forty-nine".