1222651 has 2 divisors, whose sum is σ = 1222652. Its totient is φ = 1222650.

The previous prime is 1222643. The next prime is 1222667. The reversal of 1222651 is 1562221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1222651 - 2³ = 1222643 is a prime.

1222651 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1222601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611325 + 611326.

It is an arithmetic number, because the mean of its divisors is an integer number (611326).

2^1222651 is an apocalyptic number.

1222651 is the 495-th centered decagonal number.

1222651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222651 is an equidigital number, since it uses as much as digits as its factorization.

1222651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 19.

The square root of 1222651 is about 1105.7355018267. The cubic root of 1222651 is about 106.9303124421.

Adding to 1222651 its reverse (1562221), we get a palindrome (2784872).

The spelling of 1222651 in words is "one million, two hundred twenty-two thousand, six hundred fifty-one".