1090454021 has 2 divisors, whose sum is σ = 1090454022. Its totient is φ = 1090454020.

The previous prime is 1090454009. The next prime is 1090454059. The reversal of 1090454021 is 1204540901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 583753921 + 506700100 = 24161^2 + 22510^2 .

It is an emirp because it is prime and its reverse (1204540901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1090454021 - 2¹⁴ = 1090437637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1090454621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545227010 + 545227011.

It is an arithmetic number, because the mean of its divisors is an integer number (545227011).

Almost surely, 2^1090454021 is an apocalyptic number.

It is an amenable number.

1090454021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090454021 is an equidigital number, since it uses as much as digits as its factorization.

1090454021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1090454021 is about 33022.0232723557. The cubic root of 1090454021 is about 1029.2853373457.

Adding to 1090454021 its reverse (1204540901), we get a palindrome (2294994922).

The spelling of 1090454021 in words is "one billion, ninety million, four hundred fifty-four thousand, twenty-one".