131121028 has 12 divisors (see below), whose sum is σ = 231734412. Its totient is φ = 64911200.

The previous prime is 131120989. The next prime is 131121031. The reversal of 131121028 is 820121131.

It can be written as a sum of positive squares in 2 ways, for example, as 57881664 + 73239364 = 7608^2 + 8558^2 .

It is a junction number, because it is equal to n+sod(n) for n = 131120996 and 131121014.

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, 161875 + ... + 162682.

It is an arithmetic number, because the mean of its divisors is an integer number (19311201).

Almost surely, 2^131121028 is an apocalyptic number.

It is an amenable number.

131121028 is a deficient number, since it is larger than the sum of its proper divisors (100613384).

131121028 is a wasteful number, since it uses less digits than its factorization.

131121028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324662 (or 324660 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 131121028 is about 11450.8090543856. The cubic root of 131121028 is about 508.0316645896.

Adding to 131121028 its reverse (820121131), we get a palindrome (951242159).

The spelling of 131121028 in words is "one hundred thirty-one million, one hundred twenty-one thousand, twenty-eight".