1231049921 has 8 divisors (see below), whose sum is σ = 1260786600. Its totient is φ = 1201554432.

The previous prime is 1231049899. The next prime is 1231049933. The reversal of 1231049921 is 1299401321.

It can be written as a sum of positive squares in 4 ways, for example, as 233753521 + 997296400 = 15289^2 + 31580^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231049921 - 2⁶ = 1231049857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231049321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49946 + ... + 70403.

It is an arithmetic number, because the mean of its divisors is an integer number (157598325).

Almost surely, 2^1231049921 is an apocalyptic number.

It is an amenable number.

1231049921 is a deficient number, since it is larger than the sum of its proper divisors (29736679).

1231049921 is a wasteful number, since it uses less digits than its factorization.

1231049921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120595.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1231049921 is about 35086.3209955105. The cubic root of 1231049921 is about 1071.7460417134.

The spelling of 1231049921 in words is "one billion, two hundred thirty-one million, forty-nine thousand, nine hundred twenty-one".