222561931 has 2 divisors, whose sum is σ = 222561932. Its totient is φ = 222561930.

The previous prime is 222561917. The next prime is 222561949. The reversal of 222561931 is 139165222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222561931 - 2¹³ = 222553739 is a prime.

It is a super-2 number, since 2×222561931² = 99067626260897522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 222561893 and 222561902.

It is not a weakly prime, because it can be changed into another prime (222561901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111280965 + 111280966.

It is an arithmetic number, because the mean of its divisors is an integer number (111280966).

Almost surely, 2^222561931 is an apocalyptic number.

222561931 is a deficient number, since it is larger than the sum of its proper divisors (1).

222561931 is an equidigital number, since it uses as much as digits as its factorization.

222561931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 222561931 is about 14918.5096775784. The cubic root of 222561931 is about 606.0153530441.

The spelling of 222561931 in words is "two hundred twenty-two million, five hundred sixty-one thousand, nine hundred thirty-one".