1531347428 has 12 divisors (see below), whose sum is σ = 2886001020. Its totient is φ = 706775712.

The previous prime is 1531347409. The next prime is 1531347451. The reversal of 1531347428 is 8247431351.

It can be written as a sum of positive squares in 2 ways, for example, as 797045824 + 734301604 = 28232^2 + 27098^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1531347391 and 1531347400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14724443 + ... + 14724546.

It is an arithmetic number, because the mean of its divisors is an integer number (240500085).

Almost surely, 2^1531347428 is an apocalyptic number.

It is an amenable number.

1531347428 is a deficient number, since it is larger than the sum of its proper divisors (1354653592).

1531347428 is a wasteful number, since it uses less digits than its factorization.

1531347428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29449006 (or 29449004 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 1531347428 is about 39132.4344757645. The cubic root of 1531347428 is about 1152.6335179703.

Adding to 1531347428 its reverse (8247431351), we get a palindrome (9778778779).

The spelling of 1531347428 in words is "one billion, five hundred thirty-one million, three hundred forty-seven thousand, four hundred twenty-eight".