220520491 has 2 divisors, whose sum is σ = 220520492. Its totient is φ = 220520490.

The previous prime is 220520423. The next prime is 220520501. The reversal of 220520491 is 194025022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220520491 - 2⁹ = 220519979 is a prime.

It is not a weakly prime, because it can be changed into another prime (220520191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110260245 + 110260246.

It is an arithmetic number, because the mean of its divisors is an integer number (110260246).

Almost surely, 2^220520491 is an apocalyptic number.

220520491 is a deficient number, since it is larger than the sum of its proper divisors (1).

220520491 is an equidigital number, since it uses as much as digits as its factorization.

220520491 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 25.

The square root of 220520491 is about 14849.9323567483. The cubic root of 220520491 is about 604.1567753424.

The spelling of 220520491 in words is "two hundred twenty million, five hundred twenty thousand, four hundred ninety-one".