1022491 has 2 divisors, whose sum is σ = 1022492. Its totient is φ = 1022490.

The previous prime is 1022467. The next prime is 1022501. The reversal of 1022491 is 1942201.

It is a strong prime.

It is an emirp because it is prime and its reverse (1942201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022491 is a prime.

1022491 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1022191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511245 + 511246.

It is an arithmetic number, because the mean of its divisors is an integer number (511246).

2^1022491 is an apocalyptic number.

1022491 is the 541-st centered heptagonal number.

1022491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022491 is an equidigital number, since it uses as much as digits as its factorization.

1022491 is an evil number, because the sum of its binary digits is even.

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

The square root of 1022491 is about 1011.1829705845. The cubic root of 1022491 is about 100.7441486913.

Adding to 1022491 its reverse (1942201), we get a palindrome (2964692).

The spelling of 1022491 in words is "one million, twenty-two thousand, four hundred ninety-one".