220030991 has 2 divisors, whose sum is σ = 220030992. Its totient is φ = 220030990.

The previous prime is 220030973. The next prime is 220030999. The reversal of 220030991 is 199030022.

220030991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220030991 - 2¹⁰ = 220029967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220030991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220030999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110015495 + 110015496.

It is an arithmetic number, because the mean of its divisors is an integer number (110015496).

Almost surely, 2^220030991 is an apocalyptic number.

220030991 is a deficient number, since it is larger than the sum of its proper divisors (1).

220030991 is an equidigital number, since it uses as much as digits as its factorization.

220030991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 220030991 is about 14833.4416437993. The cubic root of 220030991 is about 603.7094188339.

The spelling of 220030991 in words is "two hundred twenty million, thirty thousand, nine hundred ninety-one".