219090961 has 2 divisors, whose sum is σ = 219090962. Its totient is φ = 219090960.

The previous prime is 219090929. The next prime is 219090967. The reversal of 219090961 is 169090912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121969936 + 97121025 = 11044^2 + 9855^2 .

It is a cyclic number.

It is not a de Polignac number, because 219090961 - 2⁵ = 219090929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 219090961.

It is not a weakly prime, because it can be changed into another prime (219090967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109545480 + 109545481.

It is an arithmetic number, because the mean of its divisors is an integer number (109545481).

Almost surely, 2^219090961 is an apocalyptic number.

It is an amenable number.

219090961 is a deficient number, since it is larger than the sum of its proper divisors (1).

219090961 is an equidigital number, since it uses as much as digits as its factorization.

219090961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 219090961 is about 14801.7215552786. The cubic root of 219090961 is about 602.8484566839.

The spelling of 219090961 in words is "two hundred nineteen million, ninety thousand, nine hundred sixty-one".