1020040291 has 2 divisors, whose sum is σ = 1020040292. Its totient is φ = 1020040290.

The previous prime is 1020040261. The next prime is 1020040339. The reversal of 1020040291 is 1920400201.

1020040291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020040291 - 2¹⁵ = 1020007523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020040261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510020145 + 510020146.

It is an arithmetic number, because the mean of its divisors is an integer number (510020146).

Almost surely, 2^1020040291 is an apocalyptic number.

1020040291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020040291 is an equidigital number, since it uses as much as digits as its factorization.

1020040291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1020040291 is about 31938.0696191864. The cubic root of 1020040291 is about 1006.6359635802.

Adding to 1020040291 its reverse (1920400201), we get a palindrome (2940440492).

The spelling of 1020040291 in words is "one billion, twenty million, forty thousand, two hundred ninety-one".