1268921 has 2 divisors, whose sum is σ = 1268922. Its totient is φ = 1268920.

The previous prime is 1268899. The next prime is 1268929. The reversal of 1268921 is 1298621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698896 + 570025 = 836^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268921 - 2¹⁰ = 1267897 is a prime.

It is a super-2 number, since 2×1268921² = 3220321008482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1268929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634460 + 634461.

It is an arithmetic number, because the mean of its divisors is an integer number (634461).

2^1268921 is an apocalyptic number.

It is an amenable number.

1268921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268921 is an equidigital number, since it uses as much as digits as its factorization.

1268921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 1268921 is about 1126.4639363957. The cubic root of 1268921 is about 108.2625357282.

The spelling of 1268921 in words is "one million, two hundred sixty-eight thousand, nine hundred twenty-one".