220031491 has 2 divisors, whose sum is σ = 220031492. Its totient is φ = 220031490.

The previous prime is 220031479. The next prime is 220031531. The reversal of 220031491 is 194130022.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220031491 is a prime.

It is not a weakly prime, because it can be changed into another prime (220031401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110015745 + 110015746.

It is an arithmetic number, because the mean of its divisors is an integer number (110015746).

Almost surely, 2^220031491 is an apocalyptic number.

220031491 is a deficient number, since it is larger than the sum of its proper divisors (1).

220031491 is an equidigital number, since it uses as much as digits as its factorization.

220031491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 220031491 is about 14833.4584975993. The cubic root of 220031491 is about 603.7098761248.

The spelling of 220031491 in words is "two hundred twenty million, thirty-one thousand, four hundred ninety-one".