1092857921 has 2 divisors, whose sum is σ = 1092857922. Its totient is φ = 1092857920.

The previous prime is 1092857897. The next prime is 1092857923. The reversal of 1092857921 is 1297582901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1070009521 + 22848400 = 32711^2 + 4780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1092857921 - 2¹⁴ = 1092841537 is a prime.

Together with 1092857923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1092857923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 546428960 + 546428961.

It is an arithmetic number, because the mean of its divisors is an integer number (546428961).

Almost surely, 2^1092857921 is an apocalyptic number.

It is an amenable number.

1092857921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1092857921 is an equidigital number, since it uses as much as digits as its factorization.

1092857921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 1092857921 is about 33058.4016703772. The cubic root of 1092857921 is about 1030.0411335570.

The spelling of 1092857921 in words is "one billion, ninety-two million, eight hundred fifty-seven thousand, nine hundred twenty-one".