1231528 has 8 divisors (see below), whose sum is σ = 2309130. Its totient is φ = 615760.

The previous prime is 1231513. The next prime is 1231547. The reversal of 1231528 is 8251321.

It can be written as a sum of positive squares in only one way, i.e., 1127844 + 103684 = 1062^2 + 322^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1231528² = 3033322429568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231499 and 1231508.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76963 + ... + 76978.

2^1231528 is an apocalyptic number.

It is an amenable number.

1231528 is a deficient number, since it is larger than the sum of its proper divisors (1077602).

1231528 is a wasteful number, since it uses less digits than its factorization.

1231528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153947 (or 153943 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 1231528 is about 1109.7423124311. The cubic root of 1231528 is about 107.1884761504.

Adding to 1231528 its reverse (8251321), we get a palindrome (9482849).

The spelling of 1231528 in words is "one million, two hundred thirty-one thousand, five hundred twenty-eight".