222561949 has 2 divisors, whose sum is σ = 222561950. Its totient is φ = 222561948.

The previous prime is 222561931. The next prime is 222561959. The reversal of 222561949 is 949165222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131836324 + 90725625 = 11482^2 + 9525^2 .

It is a cyclic number.

It is not a de Polignac number, because 222561949 - 2⁵ = 222561917 is a prime.

It is a super-2 number, since 2×222561949² = 99067642285357202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222561959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111280974 + 111280975.

It is an arithmetic number, because the mean of its divisors is an integer number (111280975).

Almost surely, 2^222561949 is an apocalyptic number.

It is an amenable number.

222561949 is a deficient number, since it is larger than the sum of its proper divisors (1).

222561949 is an equidigital number, since it uses as much as digits as its factorization.

222561949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 222561949 is about 14918.5102808558. The cubic root of 222561949 is about 606.0153693815.

The spelling of 222561949 in words is "two hundred twenty-two million, five hundred sixty-one thousand, nine hundred forty-nine".