1020140491 has 2 divisors, whose sum is σ = 1020140492. Its totient is φ = 1020140490.

The previous prime is 1020140423. The next prime is 1020140507. The reversal of 1020140491 is 1940410201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020140491 - 2¹⁹ = 1019616203 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020140291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510070245 + 510070246.

It is an arithmetic number, because the mean of its divisors is an integer number (510070246).

Almost surely, 2^1020140491 is an apocalyptic number.

1020140491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020140491 is an equidigital number, since it uses as much as digits as its factorization.

1020140491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1020140491 is about 31939.6382415330. The cubic root of 1020140491 is about 1006.6689235923.

Adding to 1020140491 its reverse (1940410201), we get a palindrome (2960550692).

The spelling of 1020140491 in words is "one billion, twenty million, one hundred forty thousand, four hundred ninety-one".