1266413 has 2 divisors, whose sum is σ = 1266414. Its totient is φ = 1266412.

The previous prime is 1266409. The next prime is 1266431. The reversal of 1266413 is 3146621.

It is a happy number.

Together with next prime (1266431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1162084 + 104329 = 1078^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266413 - 2² = 1266409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633206 + 633207.

It is an arithmetic number, because the mean of its divisors is an integer number (633207).

2^1266413 is an apocalyptic number.

It is an amenable number.

1266413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266413 is an equidigital number, since it uses as much as digits as its factorization.

1266413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 1266413 is about 1125.3501677256. The cubic root of 1266413 is about 108.1911623533.

Adding to 1266413 its sum of digits (23), we get a triangular number (1266436 = T₁₅₉₁).

The spelling of 1266413 in words is "one million, two hundred sixty-six thousand, four hundred thirteen".