1211807 has 2 divisors, whose sum is σ = 1211808. Its totient is φ = 1211806.

The previous prime is 1211797. The next prime is 1211813. The reversal of 1211807 is 7081121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211807 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605903 + 605904.

It is an arithmetic number, because the mean of its divisors is an integer number (605904).

2^1211807 is an apocalyptic number.

1211807 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211807 is an equidigital number, since it uses as much as digits as its factorization.

1211807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1211807 is about 1100.8210572114. The cubic root of 1211807 is about 106.6132425612.

Adding to 1211807 its reverse (7081121), we get a palindrome (8292928).

The spelling of 1211807 in words is "one million, two hundred eleven thousand, eight hundred seven".