221790967 has 2 divisors, whose sum is σ = 221790968. Its totient is φ = 221790966.

The previous prime is 221790941. The next prime is 221790977. The reversal of 221790967 is 769097122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221790967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221790977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110895483 + 110895484.

It is an arithmetic number, because the mean of its divisors is an integer number (110895484).

Almost surely, 2^221790967 is an apocalyptic number.

221790967 is a deficient number, since it is larger than the sum of its proper divisors (1).

221790967 is an equidigital number, since it uses as much as digits as its factorization.

221790967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 221790967 is about 14892.6480855488. The cubic root of 221790967 is about 605.3147891687.

The spelling of 221790967 in words is "two hundred twenty-one million, seven hundred ninety thousand, nine hundred sixty-seven".