131622866 has 4 divisors (see below), whose sum is σ = 197434302. Its totient is φ = 65811432.

The previous prime is 131622863. The next prime is 131622877. The reversal of 131622866 is 668226131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668226131 = 137 ⋅4877563.

It can be written as a sum of positive squares in only one way, i.e., 67158025 + 64464841 = 8195^2 + 8029^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131622863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32905715 + ... + 32905718.

Almost surely, 2^131622866 is an apocalyptic number.

131622866 is a deficient number, since it is larger than the sum of its proper divisors (65811436).

131622866 is an equidigital number, since it uses as much as digits as its factorization.

131622866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65811435.

The product of its digits is 20736, while the sum is 35.

The square root of 131622866 is about 11472.7009025774. The cubic root of 131622866 is about 508.6789673982.

Adding to 131622866 its reverse (668226131), we get a palindrome (799848997).

The spelling of 131622866 in words is "one hundred thirty-one million, six hundred twenty-two thousand, eight hundred sixty-six".