222145531 has 2 divisors, whose sum is σ = 222145532. Its totient is φ = 222145530.

The previous prime is 222145519. The next prime is 222145603. The reversal of 222145531 is 135541222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222145531 - 2⁵ = 222145499 is a prime.

It is a super-2 number, since 2×222145531² = 98697273886543922, which contains 22 as substring.

It is equal to p_12234229 and since 222145531 and 12234229 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 222145496 and 222145505.

It is not a weakly prime, because it can be changed into another prime (222145501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111072765 + 111072766.

It is an arithmetic number, because the mean of its divisors is an integer number (111072766).

Almost surely, 2^222145531 is an apocalyptic number.

222145531 is a deficient number, since it is larger than the sum of its proper divisors (1).

222145531 is an equidigital number, since it uses as much as digits as its factorization.

222145531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 25.

The square root of 222145531 is about 14904.5473262357. The cubic root of 222145531 is about 605.6371776606.

Adding to 222145531 its reverse (135541222), we get a palindrome (357686753).

The spelling of 222145531 in words is "two hundred twenty-two million, one hundred forty-five thousand, five hundred thirty-one".