1531521604 has 12 divisors (see below), whose sum is σ = 2716877884. Its totient is φ = 755270784.

The previous prime is 1531521569. The next prime is 1531521611. The reversal of 1531521604 is 4061251351.

It can be written as a sum of positive squares in 2 ways, for example, as 320481604 + 1211040000 = 17902^2 + 34800^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2622177 + ... + 2622760.

Almost surely, 2^1531521604 is an apocalyptic number.

It is an amenable number.

1531521604 is a deficient number, since it is larger than the sum of its proper divisors (1185356280).

1531521604 is a wasteful number, since it uses less digits than its factorization.

1531521604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5245014 (or 5245012 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1531521604 is about 39134.6598809802. The cubic root of 1531521604 is about 1152.6772166287.

Adding to 1531521604 its reverse (4061251351), we get a palindrome (5592772955).

It can be divided in two parts, 1531521 and 604, that added together give a triangular number (1532125 = T₁₇₅₀).

The spelling of 1531521604 in words is "one billion, five hundred thirty-one million, five hundred twenty-one thousand, six hundred four".