1231438528804 has 27 divisors (see below), whose sum is σ = 2368785123313. Its totient is φ = 559733688800.

The previous prime is 1231438528769. The next prime is 1231438528811. The reversal of 1231438528804 is 4088258341321.

The square root of 1231438528804 is 1109702.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1080148647204 + 151289881600 = 1039302^2 + 388960^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24388224 + ... + 24438664.

Almost surely, 2^{1231438528804} is an apocalyptic number.

1231438528804 is the 1109702-nd square number.

It is an amenable number.

1231438528804 is a deficient number, since it is larger than the sum of its proper divisors (1137346594509).

1231438528804 is an frugal number, since it uses more digits than its factorization.

1231438528804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100908 (or 50454 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 49.

Multiplying 1231438528804 by its sum of digits (49), we get a square (60340487911396 = 7767914²).

The spelling of 1231438528804 in words is "one trillion, two hundred thirty-one billion, four hundred thirty-eight million, five hundred twenty-eight thousand, eight hundred four".