222201661531 has 4 divisors (see below), whose sum is σ = 223692948000. Its totient is φ = 220710375064.

The previous prime is 222201661519. The next prime is 222201661537. The reversal of 222201661531 is 135166102222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135166102222 = 2 ⋅67583051111.

It is a cyclic number.

It is not a de Polignac number, because 222201661531 - 2¹¹ = 222201659483 is a prime.

It is a super-2 number, since 2×222201661531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222201661493 and 222201661502.

It is not an unprimeable number, because it can be changed into a prime (222201661537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745643011 + ... + 745643308.

It is an arithmetic number, because the mean of its divisors is an integer number (55923237000).

Almost surely, 2^222201661531 is an apocalyptic number.

222201661531 is a deficient number, since it is larger than the sum of its proper divisors (1491286469).

222201661531 is a wasteful number, since it uses less digits than its factorization.

222201661531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491286468.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 222201661531 its reverse (135166102222), we get a palindrome (357367763753).

The spelling of 222201661531 in words is "two hundred twenty-two billion, two hundred one million, six hundred sixty-one thousand, five hundred thirty-one".