1075231921 has 2 divisors, whose sum is σ = 1075231922. Its totient is φ = 1075231920.

The previous prime is 1075231919. The next prime is 1075231939. The reversal of 1075231921 is 1291325701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013530896 + 61701025 = 31836^2 + 7855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1075231921 - 2¹ = 1075231919 is a prime.

It is a super-2 number, since 2×1075231921² = 2312247367874700482, which contains 22 as substring.

Together with 1075231919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1075231901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537615960 + 537615961.

It is an arithmetic number, because the mean of its divisors is an integer number (537615961).

Almost surely, 2^1075231921 is an apocalyptic number.

It is an amenable number.

1075231921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1075231921 is an equidigital number, since it uses as much as digits as its factorization.

1075231921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 1075231921 is about 32790.7291928679. The cubic root of 1075231921 is about 1024.4734701257.

The spelling of 1075231921 in words is "one billion, seventy-five million, two hundred thirty-one thousand, nine hundred twenty-one".